CN111956409A - Lifting-assisting seat - Google Patents

Abstract

The invention belongs to the technical field of seats, and relates to a lift-up seat. The invention includes a seat plate, a first through hole is opened on the seat plate, a movable plate is arranged on the inner wall of the first through hole through a first hinge shaft, a second through hole is opened on the movable plate, and a second through hole is opened on the second through hole. Two recesses, two upper leg brackets are arranged in the second recess, and a cross bar is arranged between the two upper leg brackets; a lifting mechanism that can drive the movable plate to rotate up and down is arranged under the seat plate; between the two support legs A mounting frame is arranged through the third hinge shaft, and the upper push rod and the lower push rod are arranged in the mounting frame. The upper push rod is hinged with the horizontal rod. A driving mechanism for sliding; a connecting rod is arranged on the lower end of the lower push rod, and two lower leg brackets are arranged on the connecting rod. An advantage of the present invention is that it assists the user in getting up from the seat.

Description

A lift-up seat

technical field

The invention belongs to the technical field of seats, and relates to a lift-up seat.

Background technique

At present, aging has become a prominent social problem in the world, and many elderly people have difficulty in mobility due to physical decline. Some elderly people with poor physical condition have difficulty standing up after sitting in the seat and cannot sit up smoothly, which has a great impact on the movement of the elderly and reduces the quality of life. At the same time, there are still a large number of disabled people with inconvenient legs and feet in the society. Due to the inconvenience of their legs and feet, they need to rely on arm strength to complete the seat ups. When the user lacks sufficient physical energy, the user's action is seriously affected.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems in the prior art, and propose a lift-up seat. The technical problem to be solved by the present invention is: how to enhance the strength of the user's thighs and calves to assist the user to stand from the seat rise.

The present invention is realized by the following technical solutions: a lift-up seat, which includes a seat plate, four supporting feet are fixed on the lower side of the seat plate, and also includes:

The middle part of the seat plate is provided with a first through hole, the left and right inner walls of the first through hole are rotatably provided with a first hinge shaft, the front end of the movable plate is fixed on the first hinge shaft, and the movable plate A second through hole is opened, the front and rear edges of the second through hole are respectively provided with second concave shoulders, and two upper leg brackets that can place thighs are movably arranged in the second concave shoulders. A cross bar is fixed between the leg brackets;

a lifting mechanism, which is arranged between the two supporting feet located on the rear side of the seat plate, and the lifting mechanism can drive the movable plate to rotate around the first hinge shaft;

The mounting frame is hinged between the two supporting feet located on the front side of the seat plate via the third hinge shaft, and the upper and lower ends of the mounting frame are respectively slidably provided with an upper push rod and a lower push rod along the length direction. The upper end of the rod protrudes from the upper end of the mounting frame and is hinged with the cross bar, the lower end of the lower push rod extends out of the lower end of the mounting frame, and the mounting frame is provided with a drive mechanism capable of driving the upper push rod and the lower push rod to synchronously and reversely slide A connecting rod is movably arranged on the lower end of the lower push rod, and two lower leg brackets capable of placing the calf are fixed on the connecting rod.

In the above-mentioned lift-up seat, the cross-sections of the upper leg support and the lower leg support are arc-shaped, the size of the upper leg support matches the size of the thigh, and the two side edges of the lower leg support An opening is formed therebetween, and the two openings are located on the left and right sides of the seat plate.

In the above-mentioned lift-up seat, the lifting mechanism includes a casing, a second hinge shaft is fixed between the two supporting feet on the rear side of the seat plate, and the lower side of the casing is rotatably arranged on the second hinge. On the hinge shaft, a first limit hole is opened on the upper side of the casing, a first cylinder is fixed in the casing, and a first rack is slidably arranged in the first cylinder along the length direction, so The first rack corresponds to the first limit hole, the upper end of the first rack extends out of the upper end of the first cylinder, the lower end of the first rack extends into the first cylinder, and the first rack extends into the first cylinder. A support arm and a first piston are respectively fixed at the upper and lower ends of the support arm, and the upper end of the support arm is hinged on the lower side of the movable plate; a first air cavity is formed between the first piston and the bottom of the first cylinder, and the An intake pipe and an exhaust pipe are respectively connected to the inner wall of the first air cavity, and an intake check valve and an exhaust check valve are respectively arranged on the intake pipe and the exhaust pipe; a spring is arranged in the first air cavity , the upper and lower ends of the spring are respectively pressed against the lower side of the first piston and the bottom of the first cylinder; an accumulator is arranged in the casing, and the accumulator is communicated with the first air chamber through the exhaust pipe, so The accumulator can store high-pressure air and drive the first rack to move upward by releasing the high-pressure air.

In the above-mentioned lift-up seat, the accumulator includes a second cylinder disposed in the shell, and a second rack is slidably disposed on the second cylinder along the length direction, and the second The upper end of the rack extends out of the upper end of the second cylinder, the lower end of the second rack extends into the second cylinder, and a second piston is fixed at the end, and the second piston divides the inside of the second cylinder into a second cylinder. an air cavity and a deflation cavity, the second air cavity is communicated with the first air cavity through an exhaust pipe, the air deflation cavity is provided with a deflation hole, and a first transmission is arranged between the first rack and the second rack a gear and a second transmission gear, the second transmission gear is located between the first rack and the first transmission gear and is meshed with the first rack and the first transmission gear respectively, and the second rack is connected with the first transmission gear The gears correspond; the inner wall of the casing is provided with a positioning mechanism capable of positioning the second rack and disengaging the second rack from the first transmission gear.

In the above-mentioned lift-up seat, the positioning mechanism includes a positioning frame, and the positioning frame has a movable cavity, a sliding block is slidably arranged in the movable cavity, and an upper wedge is fixed on the sliding block. , the upper end of the second rack is fixed with a lower wedge block, the upper wedge block is matched with the lower wedge block, an electromagnetic coil is arranged around the inner wall of the movable cavity, and the slider is magnetically connected with the electromagnetic coil; When the lower wedge block moves to the position corresponding to the upper wedge block, after the electromagnetic coil is energized, the electromagnetic coil drives the upper wedge block to extend out of the movable cavity through the slider, and the upper wedge block pushes the lower wedge block Move down to disengage the second rack from the first drive gear.

In the above-mentioned lift-up seat, a vent pipe is connected to the inner wall of the second air cavity, and a safety valve is arranged on the vent pipe.

In the above-mentioned lift-up seat, a stepper motor is arranged in the shell, and the output shaft of the stepper motor is connected with a transmission gear through a conveyor belt.

In the above-mentioned lift-up seat, a first concave shoulder is formed on the rear edge of the first through hole, and a convex edge is formed on the rear edge of the movable plate, and the convex edge is connected with the first concave edge. Correspondingly to the shoulder, when the movable plate rotates downward around the first hinge shaft, there is at least one position where the convex edge is located on the bottom of the first concave shoulder.

In the above-mentioned lift-up seat, the driving mechanism includes a first transmission rack and a second transmission rack that are slidably arranged along the length direction of the mounting frame, and the first transmission rack is fixedly connected to the upper push rod , the second transmission rack is fixedly connected with the lower push rod, an intermediate gear is meshed and connected between the first transmission rack and the second transmission rack; the installation frame is provided with a telescopic motor, and the telescopic motor The output shaft is in driving connection with the shaft of the intermediate gear.

Compared with the prior art, the device has the following advantages:

1. When the seat is not in use, the movable plate is inclined upward under the action of the lifting mechanism. After the user sits on the movable board, the lifting mechanism drives the movable board to rotate counterclockwise around the first hinge shaft, so that the movable board is flush with the seat board. to buffer effect.

When the user stands up and leaves the seat, firstly, the lifting mechanism drives the movable plate to rotate clockwise around the first hinge axis, and the movable plate lifts the user's upper limbs and the height of the center of gravity, which is convenient for the user to stand up; at the same time, the movable plate The mounting frame is also driven to rotate clockwise around the third hinge axis through the two upper leg brackets. At this time, the user's calf is placed on the two lower leg supports respectively, and the two lower leg supports drive the user's calf to move backward, and the calf completes the stand-up preparation action. Then, the driving mechanism drives the upper push rod and the lower push rod to extend out of the mounting frame synchronously. The upper push rod crossbar drives the two upper leg brackets to move upwards, and the upper leg brackets give the user an upward support force; the lower push rod drives the two lower leg brackets to tilt downward through the connecting rod, and the lower leg brackets provide the user's calf with an upward support force. a downward thrust. The support force and the thrust force respectively increase the strength of the user's thigh and calf, synchronously assist the user's thigh and calf to move, reduce the weight of the user's knee, and assist the user to stand up.

In the above process, the seat first increases the height of the user's center of gravity through the movable plate, and then increases the strength of the user's thigh and calf through the upper leg bracket and the lower leg bracket respectively, and uses these two methods to assist the user's upper and lower limb movements. Help the user complete the stand-up motion.

2. After the user sits on the movable panel, the movable panel rotates downward around the first hinge axis under the action of gravity. The movable plate drives the first rack to slide down through the support arm, so that the first piston compresses the spring and discharges the air in the first air chamber to the accumulator through the exhaust pipe and the exhaust one-way valve in turn. High pressure air is stored inside. During the downward rotation of the movable plate, most of the gravitational potential energy generated by the user is converted into the elastic potential energy of the spring and the pressure energy of the high-pressure air in the accumulator. When the user sits on the movable board, the movable board vibrates up and down due to the user's activities, and the first piston discharges the outside air through the intake pipe, the intake check valve, the exhaust pipe and the exhaust check valve to the energy storage. In the accumulator, the pressure energy of the high-pressure air in the accumulator is further increased. When the user is ready to stand up and leave the seat, open the accumulator, and the accumulator releases high-pressure air. The high-pressure air and the spring jointly drive the first rack to move upward, and the first rack drives the movable plate to rotate upward around the first hinge axis through the support arm, so as to raise the upper limb of the user and increase the height of the center of gravity.

In the above process, the gravitational potential energy generated by the user's activities is converted into the pressure energy of the high-pressure air in the accumulator. This method recovers the energy generated by the user's activities in a timely manner, and is green and pollution-free.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention in a working state.

FIG. 2 is a cross-sectional view of the structure at A-A in FIG. 1 .

FIG. 3 is an enlarged view of the structure at B in FIG. 1 .

FIG. 4 is a schematic view of the lifting mechanism in the present invention.

FIG. 5 is an enlarged view of the structure at C in FIG. 4 .

FIG. 6 is a schematic view of the mechanism of the mounting frame in the present invention.

In the figure, 1, seat plate; 11, first through hole; 12, first concave shoulder; 13, support foot; 14, armrest; 2, movable plate; 21, first hinge shaft; 22, second through hole; 23, the second concave shoulder; 24, the convex edge; 3, the lifting mechanism; 31, the shell; 32, the second hinge shaft; 33, the first limit hole; 34, the second limit hole; 35, the first transmission gear 351, the second transmission gear; 36, the stepping motor; 37, the conveyor belt; 38, the support arm; 4, the first cylinder; 41, the first rack; 42, the first piston; 43, the spring; 44, the first An air cavity; 45, intake pipe; 451, intake check valve; 46, exhaust pipe; 461, exhaust check valve; 5, second cylinder; 51, second rack; 511, lower wedge block 52, the second piston; 53, the vent hole; 54, the vent chamber; 55, the second air chamber; 551, the vent pipe; 552, the safety valve; 6, the mounting frame; 61, the third hinge shaft; 62, the push up Rod; 63, lower push rod; 64, first transmission rack; 65, second transmission rack; 66, telescopic motor; 7, upper leg bracket; 71, cross bar; 8, connecting rod; 81, lower leg bracket; 82, opening; 83, scroll spring; 84, fourth hinge shaft; 85, hinge frame; 9, positioning frame; 91, movable cavity; 92, electromagnetic coil 93, slider; 94, upper wedge block.

Detailed ways

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

Referring to FIGS. 1 to 6 , a lift-up seat includes a seat plate 1 , four supporting feet 13 are fixed on the lower side of the seat plate 1 , and the left and right edges of the seat plate 1 are fixed with Armrest 14, which also includes:

The movable plate 2, a first through hole 11 is opened in the middle of the seat plate 1, and a first hinge shaft 21 is rotatably provided on the left and right inner walls of the first through hole 11, and the first hinge shaft 21 is close to the seat plate 1. The front end of the movable plate 2 is fixed on the first hinge shaft 21, the movable plate 2 is provided with a second through hole 22, and the front and rear edges of the second through hole 22 are respectively provided with second concave shoulders 23 , the second concave shoulder 23 is movably provided with two upper leg brackets 7 that can place thighs, and a cross bar 71 is fixed between the two upper leg brackets 7;

The lifting mechanism 3 is arranged between the two supporting feet 13 on the rear side of the seat plate 1, and the lifting mechanism 3 can drive the movable plate 2 to rotate around the first hinge shaft 21;

The mounting frame 6 is hinged between the two supporting feet 13 located on the front side of the seat plate 1 through the third hinge shaft 61 and below the seat plate 1, the mounting frame 6 and the lifting mechanism 3 are respectively located on the front and rear sides of the seat plate 1, The upper and lower ends of the mounting frame 6 are respectively slidably provided with an upper push rod 62 and a lower push rod 63 along the length direction. The lower end of the push rod 63 protrudes from the lower end of the mounting frame 6, and the mounting frame 6 is provided with a driving mechanism capable of driving the upper push rod 62 and the lower push rod 63 to slide in reverse synchronously; the lower end of the lower push rod 63 is movably arranged on the upper There is a connecting rod 8, and two lower leg brackets 81 are fixed on the connecting rod 8 for placing the lower leg.

When the seat is not in use, the movable plate 2 is inclined upward under the action of the lifting mechanism 3, and at this time, the angle formed between the movable plate 2 and the seat plate 1 is between 30 degrees and 40 degrees. After the user sits on the movable plate 2, the lifting mechanism 3 drives the movable plate 2 to rotate counterclockwise around the first hinge shaft 21, so that the movable plate 2 is flush with the seat plate 1. During this process, the user gradually sits on the seat. At the same time, the upper push rod 62 and the lower push rod 63 retract into the mounting frame 6 synchronously, and the upper push rod 62 drives the two upper leg brackets 7 to move downward through the cross bar 71, so that the two Each upper leg support 7 is located in the second concave shoulder 23 .

When the user stands up and leaves the seat, firstly, the lifting mechanism 3 drives the movable plate 2 to rotate clockwise around the first hinge shaft 21, and the movable plate 2 lifts the upper limb of the user and raises the height of the center of gravity, which is convenient for the user to stand up; At the same time, the movable plate 2 also drives the mounting frame 6 to rotate clockwise around the third hinge shaft 61 through the two upper leg brackets 7 . At this time, the user's calf is placed on the two lower leg brackets 81 respectively, and the two lower leg brackets 81 drive the user's calf to move backward, and the calf is ready to stand up. Then, the driving mechanism drives the upper push rod 62 and the lower push rod 63 to extend out of the mounting frame 6 synchronously. The upper push rod 62 drives the two upper leg brackets 7 to move upward through the cross bar 71, and the upper leg bracket 7 provides an upward supporting force to the user's thighs; the lower push rod 63 drives the two lower leg brackets 81 through the connecting rod 8 to tilt downward. Movement, the lower leg support 81 gives a downward thrust to the user's lower leg. The support force and the thrust force respectively increase the strength of the user's thigh and calf, synchronously assist the user's thigh and calf to move, reduce the weight of the user's knee, and assist the user to stand up.

In the above process, the seat first increases the height of the user's center of gravity through the movable plate 2, and then increases the strength of the user's thighs and calves through the upper leg bracket 7 and the lower leg bracket 81 respectively, and assists the user's upper and lower limbs in these two ways. movement to help the user complete the stand-up action.

Specifically, the cross sections of the upper leg bracket 7 and the lower leg bracket 8 are arc-shaped, the size of the upper leg bracket 7 matches the size of the thigh, and the length direction of the upper leg bracket 7 is the same as that of the seat plate 1 . The length directions are the same, openings 82 are formed between the two side edges of the lower leg bracket 81 , the lower leg bracket 81 is arranged vertically downward, and the two openings 82 are respectively located on the left and right sides of the seat plate 1 .

When the seat assists the user to stand up, the user's lower leg is placed in the lower leg support 81 through the opening 82 . The movable plate 2 rotates clockwise around the first hinge shaft 21 , and the mounting frame 6 assists the user's calf to move backward through the lower leg bracket 81 , so as to help the calf to complete the stand-up preparation. When the driving mechanism is activated, the thrust generated by the lower push rod 63 is transmitted to the calf through the lower leg bracket 81 to enhance the strength of the calf and assist the user to stand up. After the user stands up, the lower leg passes through the opening 82 and is disengaged from the lower leg support 81 .

Further, a hinge frame 85 is fixed on the connecting rod 8 , and the lower push rod 63 is rotatably arranged on the hinge frame 85 via a fourth hinge shaft 84 . A scroll spring 83 is disposed between, the outer end of the scroll spring 83 is fixed on the hinge frame 85 , and the inner end of the scroll spring 83 is fixed on the fourth hinge shaft 84 .

The connecting rod 8 rotates up and down around the fourth hinge shaft 84 to compress the scroll spring 83, so that the lower leg bracket 81 fits on the user's lower leg, and after the lower leg is separated from the lower leg bracket 81, the scroll spring 83 is reset. Lower leg support 81 for calf comfort.

Specifically, the lifting mechanism 3 includes a casing 31 , a second hinge shaft 32 is fixed between the two supporting feet 13 on the rear side of the seat plate 1 , and the lower side of the casing 31 is rotatably arranged on the second hinge On the shaft 32, a first limiting hole 33 is opened on the upper side of the casing 31, a first cylinder 4 is fixed in the casing 31, and a first cylinder 4 is slidably arranged in the first cylinder 4 along the length direction. A rack 41, the first rack 41 corresponds to the first limiting hole 33, the upper end of the first rack 41 protrudes from the upper end of the first cylinder 4, and the lower end of the first rack 41 extends into the Inside a cylinder 4, a support arm 38 and a first piston 42 are respectively fixed on the upper and lower ends of the first rack 41, and the upper end of the support arm 38 is hinged on the lower side of the movable plate 2; the first piston A first air cavity 44 is formed between 42 and the bottom of the first cylinder 4, and the inner wall of the first air cavity 44 is connected with an intake pipe 45 and an exhaust pipe 46, respectively. An intake check valve 451 and an exhaust check valve 461 are respectively provided; a spring 43 is arranged in the first air chamber 44, and the upper and lower ends of the spring 43 press against the lower side of the first piston 42 and the first The bottom of the cylinder 4; an accumulator is arranged in the casing 31, the accumulator communicates with the first air chamber 44 through the exhaust pipe 46, and the accumulator can store high-pressure air and drive by releasing the high-pressure air The first rack 41 moves upward.

After the user sits on the movable panel 2, the movable panel 2 rotates counterclockwise around the first hinge shaft 21 under the action of gravity. The movable plate 2 drives the first rack 41 to slide down through the support arm 38, so that the first piston 42 compresses the spring 43 and discharges the air in the first air chamber 44 through the exhaust pipe 46 and the exhaust one-way valve 461 in sequence. Inside the accumulator, high pressure air is stored in the accumulator. During the counterclockwise rotation of the movable plate 2, most of the gravitational potential energy generated by the user is converted into the elastic potential energy of the spring 43 and the pressure energy of the high-pressure air in the accumulator, which plays a buffering role; the exhaust check valve 461 prevents the Air backflow.

When the user sits on the movable plate 2, the movable plate 2 vibrates up and down due to the user's activities, and the first piston 42 passes the outside air through the intake pipe 45, the intake check valve 451, the exhaust pipe 46 and the exhaust air in sequence. The valve 461 is discharged into the accumulator to further increase the pressure energy of the high-pressure air in the accumulator. When the user is ready to stand up and leave the seat, open the accumulator, and the accumulator releases high-pressure air. The high-pressure air and the spring 43 together drive the first rack 41 to move upward, and the first rack 41 drives the movable plate 2 to rotate upward around the first hinge shaft 21 through the support arm 38 to raise the user's upper limb and increase the height of the center of gravity.

In the above process, the gravitational potential energy generated by the user's activities is converted into the pressure energy of the high-pressure air in the accumulator. This method recovers the energy generated by the user's activities in a timely manner, and is green and pollution-free.

Specifically, the accumulator includes a second cylinder 5 disposed in the housing 31 , and a second rack 51 is slidably disposed on the second cylinder 5 along the length direction. The second rack 51 The upper end protrudes from the upper end of the second cylinder 5 , the lower end of the second rack 51 protrudes into the second cylinder 5 and a second piston 52 is fixed at the end, and the second piston 52 pushes the inside of the second cylinder 5 It is divided into a second air cavity 55 and a venting cavity 54. The second air cavity 55 communicates with the first air cavity 44 through the exhaust pipe 46. The venting cavity 54 is provided with a venting hole 53. The first rack 41 A first transmission gear 35 and a second transmission gear 351 are arranged between the first gear rack 41 and the second transmission gear 35 and are respectively connected with the first gear rack 41 is meshed with the first transmission gear 35, and the second rack 51 corresponds to the first transmission gear 35; the inner wall of the housing 31 is provided with a device capable of positioning the second rack 51 and disengaging the second rack 51 from the first transmission gear 35. A positioning mechanism for the transmission gear 35 .

When the user sits on the movable panel 2 , the positioning mechanism locates the second rack 51 and separates it from the first transmission gear 35 , and the first piston 42 discharges the air in the first air chamber 44 into the second air chamber 55 inside the second air chamber 55 to store high-pressure air. As the user moves on the movable panel 2, the first piston 42 discharges the outside air into the second air chamber 55, and the pressure of the high-pressure air in the second air chamber 55 can be further increased. When the user leaves the seat, the positioning mechanism is opened, and the high-pressure air in the second air chamber 55 drives the second rack 51 to slide upward through the second piston 52. The second rack 51 first meshes with the first transmission gear 35, and then drives the second rack 51. The second transmission gear 351 rotates, and then drives the first rack 41 to slide upward through the second transmission gear 351 ; at the same time, the spring 43 also drives the first rack 41 to slide upward through the first piston 42 . Therefore, the high-pressure air in the second air chamber 55 and the spring 43 together drive the first rack 41 , so that the support arm 38 drives the movable plate 2 to rotate upward around the first hinge shaft 21 . After the user leaves the seat, the spring 43 is further reset, driving the first piston 42 to continue to slide upward; the air pressure in the second air chamber 55 is greater than the air pressure in the deflation chamber 56, and the air in the second air chamber 55 continues to drive the second air chamber 55. The piston 52 slides upwards and passes over the vent hole 53 , and the air in the second air chamber 55 is exhausted to the outside through the vent hole 53 .

When the user sits on the seat again, the movable plate 2 rotates downward around the first hinge shaft 21 , and drives the first rack 41 to slide downward through the support arm 38 . The first rack 41 drives the first piston 42 and the second rack 51 to slide down synchronously. The first piston 42 discharges the air in the first air chamber 44 into the second air chamber 55 ; the second piston 52 compresses the air in the second air chamber 55 to form high pressure air in the second air chamber 55 . When the second rack 51 slides down to the bottom dead center, the positioning mechanism is opened, and the positioning mechanism disengages the second rack 51 from the first transmission gear 35 and positions it below the positioning mechanism.

The structure converts the user's gravitational potential energy into the pressure energy of the high-pressure air in the accumulator, and uses the pressure energy of the high-pressure air and the elastic potential energy of the spring 43 as energy sources to drive the movable board 2 to raise the user's upper limbs. This way makes full use of green energy, is green and environmentally friendly, and has no pollution.

Further, the upper side surface of the housing 31 is provided with a second limiting hole 34 , and the second limiting hole 34 corresponds to the second rack 51 .

During the upward sliding of the second rack 51 , the upper end of the second rack 51 passes through the second limiting hole 34 to prevent the casing 31 from blocking the movement of the second rack 51 .

Specifically, the positioning mechanism includes a positioning frame 9 , and the positioning frame 9 has a movable cavity 91 , a sliding block 93 is slidably arranged in the movable cavity 91 , and an upper wedge block 94 is fixed on the sliding block 93 . , the upper end of the second rack 51 is fixed with a lower wedge block 511, the upper wedge block 94 is matched with the lower wedge block 511, an electromagnetic coil 92 is arranged around the inner wall of the movable cavity 91, and the slider 93 is magnetically connected with the electromagnetic coil 92; when the lower wedge block 511 moves to the position corresponding to the upper wedge block 94, after the electromagnetic coil 92 is energized, the electromagnetic coil 92 drives the upper wedge block 94 to extend through the slider 93. Out of the movable cavity 91 , the upper wedge block 94 pushes the lower wedge block 511 to move downward, so that the second rack 51 is separated from the first transmission gear 35 .

When the second rack 51 slides down to the bottom dead center, the positioning mechanism is opened, and the electromagnetic coil 92 is energized. The slider 93 pushes the lower wedge block 511 to move downward through the upper wedge block 94 , and the lower wedge block 511 drives the second rack 51 to continue sliding downward, so that the second rack 51 is separated from the first transmission gear 35 . When the user is ready to leave the seat, the positioning mechanism is closed, the electromagnetic coil 92 is powered off, and the magnetic force generated by the electromagnetic coil 92 to the slider 93 disappears. The high-pressure air drives the second rack 51 to slide upward through the second piston 52 , and the lower wedge block 511 pushes the upper wedge block 94 to retract the slider 93 into the movable cavity 91 . The structure is simple and the operation is convenient.

Preferably, the switch of the positioning mechanism is provided on the armrest 14 .

Specifically, a vent pipe 551 is connected to the inner wall of the second air cavity 55 , and a safety valve 552 is provided on the vent pipe 551 .

When the air pressure in the second air chamber 55 is greater than the air pressure set by the safety valve 552 , part of the high-pressure air is discharged from the safety valve 552 . Therefore, the setting of the safety valve 552 prevents the air pressure in the second air chamber 55 from being too high.

Specifically, a stepper motor 36 is disposed in the casing 31 , and the output shaft of the stepper motor 36 is connected to a transmission gear 35 via a conveyor belt 37 in a driving manner.

When the air pressure in the second air chamber 55 is not enough to drive the user's upper limb to lift up through the movable plate 2 , the stepping motor 36 is started to rotate forward. The stepping motor 36 drives the transmission gear 35 to rotate through the conveyor belt 37 , and further makes the first rack 41 slide upwards, so that the support arm 38 pushes the movable plate 2 to move upwards.

When the weight of the user is light enough to drive the second rack 51 to slide down to the bottom dead center, the stepping motor 36 is started to reverse. The stepping motor 36 drives the second rack 51 to slide down to the bottom dead center through the transmission gear 35 , and then opens the positioning mechanism, thereby disengaging the second rack 51 from the transmission gear 35 .

Therefore, the structure provides an additional external force under special circumstances to promote the normal operation of the seat.

Specifically, a first concave shoulder 12 is formed on the rear edge of the first through hole 11 , and a convex edge 24 is formed on the rear edge of the movable plate 2 , and the convex edge 24 is connected to the first concave shoulder 12 . Correspondingly, when the movable plate 2 rotates around the first hinge shaft 21 , there is at least one position where the raised edge 24 is located on the bottom of the first concave shoulder 12 .

The user sits on the movable board 2 and rotates the movable board 2 downward until the convex edge 24 abuts on the first concave shoulder 12 , so that the movable board 2 is flush with the seat board 1 .

Specifically, the driving mechanism includes a first transmission rack 64 and a second transmission rack 65 slidably arranged along the length of the mounting frame 6 , the first transmission rack 64 is fixedly connected with the upper push rod 62 , so The second transmission rack 65 is fixedly connected with the lower push rod 63, an intermediate gear 67 is meshed and connected between the first transmission rack 64 and the second transmission rack 65; the mounting frame 6 is provided with a telescopic motor 66 , the output shaft of the telescopic motor 66 is connected with the transmission gear 67 in a driving manner.

When the telescopic motor 66 is activated, it drives the first transmission rack 64 and the second transmission rack 65 to slide in the opposite direction synchronously, so that the upper push rod 62 and the lower push rod 63 extend and retract into the mounting frame 6 synchronously. The structure is simple and the cost is low.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definitions of the appended claims range.

Claims (9)

1. The utility model provides a seat of having helped rise, its includes seat (1), four supporting legss (13) have set firmly on seat (1) downside, its characterized in that still includes:

the chair comprises a movable plate (2), wherein a first through hole (11) is formed in the middle of the seat plate (1), a first hinge shaft (21) is rotatably arranged on the left inner wall and the right inner wall of the first through hole (11), the front end of the movable plate (2) is fixedly arranged on the first hinge shaft (21), a second through hole (22) is formed in the movable plate (2), second concave shoulders (23) are respectively formed in the front edge and the rear edge of the second through hole (22), two upper leg supports (7) capable of placing thighs are movably arranged in the second concave shoulders (23), and a cross rod (71) is fixedly arranged between the two upper leg supports (7);

the lifting mechanism (3) is arranged between the two supporting legs (13) positioned at the rear side of the seat plate (1), and the lifting mechanism (3) can drive the movable plate (2) to rotate around the first hinge shaft (21);

the mounting frame (6) is hinged between two supporting legs (13) positioned on the front side of the seat plate (1) through a third hinge shaft (61), an upper push rod (62) and a lower push rod (63) are respectively arranged at the upper end and the lower end of the mounting frame (6) in a sliding mode along the length direction, the upper end of the upper push rod (62) extends out of the upper end of the mounting frame (6) and is hinged with a cross rod (71), the lower end of the lower push rod (63) extends out of the lower end of the mounting frame (6), and a driving mechanism capable of driving the upper push rod (62) and the lower push rod (63) to synchronously and reversely slide is arranged on the mounting frame (6; the lower end of the lower push rod (63) is movably provided with a connecting rod (8), and two lower leg supports (81) capable of placing lower legs are fixedly arranged on the connecting rod (8).

2. A booster seat as claimed in claim 1, characterised in that the upper leg support (7) and the lower leg support (8) are each circular in cross section, the upper leg support (7) has dimensions matching those of the thighs, an opening (82) is formed between the two side edges of the lower leg support (81), the two openings (82) being located on the left and right sides of the seat plate (1).

3. The booster seat as claimed in claim 1, wherein the lifting mechanism (3) comprises a housing (31), a second hinge shaft (32) is fixedly arranged between two support legs (13) at the rear side of the seat plate (1), the lower side of the housing (31) is rotatably arranged on the second hinge shaft (32), a first limiting hole (33) is formed on the upper side of the housing (31), a first cylinder (4) is fixedly arranged in the housing (31), a first rack (41) is slidably arranged in the first cylinder (4) along the length direction, the first rack (41) corresponds to the first limiting hole (33), the upper end of the first rack (41) extends out of the upper end of the first cylinder (4), the lower end of the first rack (41) extends into the first cylinder (4), the upper end and the lower end of the first rack (41) are respectively fixedly provided with a support arm (38) and a first piston (42), the upper end of the supporting arm (38) is hinged on the lower side surface of the movable plate (2); a first air cavity (44) is formed between the first piston (42) and the bottom of the first cylinder (4), the inner wall of the first air cavity (44) is connected with an air inlet pipe (45) and an air outlet pipe (46) respectively, and the air inlet pipe (45) and the air outlet pipe (46) are provided with an air inlet check valve (451) and an air outlet check valve (461) respectively; a spring (43) is arranged in the first air cavity (44), and the upper end and the lower end of the spring (43) are respectively pressed against the lower side surface of the first piston (42) and the bottom of the first cylinder (4); an energy accumulator is arranged in the shell (31) and is communicated with the first air cavity (44) through an exhaust pipe (46), and the energy accumulator can store high-pressure air and drive the first rack (41) to move upwards by releasing the high-pressure air.

4. A lifting-assisted seat according to claim 3, wherein the energy accumulator comprises a second cylinder (5) arranged in the housing (31), a second rack (51) is arranged on the second cylinder (5) in a sliding manner along the length direction, the upper end of the second rack (51) extends out of the upper end of the second cylinder (5), the lower end of the second rack (51) extends into the second cylinder (5) and the end part of the second rack is fixedly provided with a second piston (52), the second piston (52) divides the interior of the second cylinder (5) into a second air cavity (55) and a gas release cavity (54), the second air cavity (55) is communicated with the first air cavity (44) through an exhaust pipe (46), the gas release cavity (54) is provided with a gas release hole (53), and a first transmission gear (35) and a second transmission gear (351) are arranged between the first rack (41) and the second rack (51), the second transmission gear (351) is positioned between the first rack (41) and the first transmission gear (35) and is respectively meshed with the first rack (41) and the first transmission gear (35), and the second rack (51) corresponds to the first transmission gear (35); and a positioning mechanism capable of positioning the second rack (51) and enabling the second rack (51) to be separated from the first transmission gear (35) is arranged on the inner wall of the shell (31).

5. A lifting-assisted seat according to claim 4, characterized in that the positioning mechanism comprises a positioning frame (9), a movable cavity (91) is arranged in the positioning frame (9), a sliding block (93) is arranged in the movable cavity (91) in a sliding manner, an upper wedge block (94) is fixedly arranged on the sliding block (93), a lower wedge block (511) is fixedly arranged at the upper end of the second rack (51), the upper wedge block (94) is matched with the lower wedge block (511), an electromagnetic coil (92) is arranged on the inner wall of the movable cavity (91) in a surrounding manner, and the sliding block (93) is magnetically connected with the electromagnetic coil (92); when the lower wedge block (511) moves to a position corresponding to the upper wedge block (94), after the electromagnetic coil (92) is electrified, the electromagnetic coil (92) drives the upper wedge block (94) to extend out of the movable cavity (91) through the sliding block (93), and the upper wedge block (94) pushes the lower wedge block (511) to move downwards, so that the second rack (51) is separated from the first transmission gear (35).

6. A booster seat according to claim 4, characterized in that a release vent (551) is connected to the inner wall of the second air chamber (55), and a safety valve (552) is provided on the release vent (551).

7. A booster seat as claimed in claim 4, characterised in that a stepper motor (36) is provided within the housing (31), the output shaft of the stepper motor (36) being drivingly connected to a drive gear (35) via a drive belt (37).

8. A booster seat as claimed in claim 1, characterized in that said first through hole (11) has a first recess (12) formed on its rear edge, said movable plate (2) has a flange (24) formed on its rear edge, said flange (24) corresponding to said first recess (12), said flange (24) being located on the bottom of said first recess (12) in at least one position when said movable plate (2) is rotated about said first hinge axis (21).

9. The booster seat as claimed in claim 1, wherein the driving mechanism comprises a first driving rack (64) and a second driving rack (65) which are slidably arranged along the length direction of the mounting frame (6), the first driving rack (64) is fixedly connected with the upper push rod (62), the second driving rack (65) is fixedly connected with the lower push rod (63), and an intermediate gear (67) is engaged and connected between the first driving rack (64) and the second driving rack (65); be provided with flexible motor (66) on mounting bracket (6), flexible motor (66) output shaft is connected with the shaft drive of intermediate gear (67).

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