Supporting frame

Abstract

The invention discloses a supporting frame which effectively solves the problems that a pillow is prone to sliding, neck nesting and cervical vertebra injury in the mode that the upper body of a patient is lifted at present. Comprising a base, first swing rods are fixed to the front side and the rear side of a rotating shaft respectively, second swing rods are hinged to the upper ends of the first swing rods, the right side of a swing plate is rotationally connected with a front-back axial transmission shaft, an empty groove with an opening away from the base is formed in the swing plate, and two left-right opposite front-back axial supporting shafts are rotationally connected into the two swing grooves respectively; rectangular cylinders with upward openings are fixed to the opposite sides of every two front-back opposite supporting shafts correspondingly, rectangular rods are slidably connected into the rectangular cylinders, and a flat plate is hinged to the upper ends of the multiple rectangular rods. The device is novel in conception, ingenious in structure, convenient to operate and high in practicability, can lift and support the upper body of a patient, solves the problems of neck nesting and easy slipping caused by head raising in a traditional mode, improves the supporting effect, is suitable for different patients, and can be popularized and used.

Description

Technical Field

[0001] The invention relates to the technical field of medical auxiliary equipment, in particular to a support frame. Background Art

[0002] Gastroesophageal reflux disease is a common digestive system disease characterized by abnormal reflux of gastric contents (including gastric acid and food in the stomach) into the esophagus, causing irritation and damage to the esophageal mucosa by gastric acid. Its pathogenesis mainly involves dysfunction of the lower esophageal sphincter, such as excessive sphincter relaxation and decreased esophageal clearance ability. Typical symptoms of gastroesophageal reflux disease include acid reflux, heartburn, chest pain and sore throat. Some patients may also have symptoms such as dysphagia, hoarseness and cough. If it is not effectively controlled for a long time, it may lead to esophageal inflammation, esophageal ulcer, Barrett's esophagus, and even esophageal cancer.

[0003] Therefore, when patients with gastroesophageal reflux lie flat to sleep, the stomach and esophagus are at the same level. When the gravity is weakened, gastric acid is more likely to reflux into the esophagus, leading to a series of uncomfortable symptoms such as heartburn, acid reflux, and chest pain. By properly raising the head of the bed or raising the upper body and tilting the bed board by 15°-30°, gravity can be used to reduce the occurrence of gastric acid reflux. This sleeping position can make the esophagus higher than the stomach, forming a certain height difference, making it difficult for gastric contents to reflux into the esophagus. At the same time, raising the upper body can also improve the function of the lower esophageal sphincter and enhance its anti-reflux ability.

[0004] Currently, when the patient is in the hospital, they can shake the handle to raise the patient's upper body at the head of the bed and place a pillow under the head to support the head and neck. However, when the patient turns over, the pillow may slide or shift due to the tilt of the bed board, and the patient or family members need to adjust the position of the pillow, which reduces the patient's experience. At home, patients generally use two to three pillows or quilts to raise their heads in order to raise the patient's head and upper body. However, the neck may be sunken, which may easily damage the cervical spine and increase the patient's discomfort. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a support frame, which effectively solves the problem that the pillow is easy to slide, dent the neck, and easily damage the cervical spine in the current way of raising the patient's upper body.

[0006] The technical solution is as follows: the present invention comprises a base, a storage groove with an opening facing upward and a left side connected with the outside world is provided on the base, a swing plate is hingedly connected to the left side of the storage groove via a hinge shaft in the front and rear axial directions, a rotating shaft in the front and rear axial directions is rotatably connected to the right side of the storage groove, a first swing rod is fixed to the front and rear sides of the rotating shaft respectively, a second swing rod is hingedly connected to the upper end of the first swing rod, a transmission shaft in the front and rear axial directions is rotatably connected to the right side of the swing plate, the upper ends of the two second swing rods are respectively fixedly connected to the transmission shaft, an empty groove with an opening away from the base is provided on the swing plate, a swing groove is connected downwardly at the front and rear sides of the empty groove respectively, two supporting shafts opposite to each other and in the front and rear axial directions are rotatably connected in the two swing grooves, the supporting shaft on the right side can rotate with the transmission shaft, and the rotation directions of the supporting shaft and the transmission shaft are opposite, a rectangular cylinder with an opening facing upwards is fixed to the opposite sides of each two supporting shafts opposite to each other in the front and rear directions, a rectangular rod is slidably connected in the rectangular cylinder, and a flat plate is hingedly connected to the upper ends of the plurality of rectangular rods;

[0007] The length between the left and right ends of the empty slot and the length of the swing slot are both greater than the width of the flat plate. A through slot with an opening facing downward is connected to the left side of the empty slot. A box body with an upper opening connected to the through slot is fixed to the lower side of the swing plate. A slide plate is provided in the through slot, which can move up and down as the support shaft on the left side rotates. Soft pads are fixed to the upper surfaces of the slide plate, the upper surfaces of the swing plate and the upper surfaces of the flat plate.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] The invention has novel concept, ingenious structure, convenient operation and strong practicality. The swing plate and the flat plate can be opened and folded by turning a hand wheel, which is convenient to store and carry. The upper body of the patient can be raised and supported. At the same time, the problem of the neck being sunken and the head being easy to slip caused by the traditional method of raising the head is solved, and the supporting effect is improved. The invention is suitable for different patients and can be promoted for use.

[0010] A rectangular tube and a rectangular rod are provided, and the height between the flat plate and the swing plate can be adjusted by turning the knob to release the limit of the limit block, which is equivalent to adjusting the height of the pillow, so as to meet the needs of different patients and improve the patient experience.

[0011] A slide plate is provided which can move with the swing of the swing plate, so that the slide plate pushes the soft cushion thereon to extend out of the through slot to support the upper body of the patient after the swing plate swings to the angle required by the patient, thereby increasing the comfort of the patient. When the swing plate is folded, the slide plate slides downward into the box body to make way for the flat plate, thereby reducing the volume of the device after folding, and facilitating carrying and storage;

[0012] The first intermittent gear, the second intermittent gear and the locking block are provided, so that the flat plate can be unfolded when the swing plate swings at a small angle. The locking block prevents the support shaft from accidentally rotating, thereby ensuring the stability of the flat plate after unfolding, and also ensuring the stability of the flat plate when the swing plate swings from 15° to 30°. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an axonometric view of the present invention.

[0014] Figure 2 It is a front view of the present invention cut along the center of the cross bar.

[0015] Figure 3 It is a full cutaway front view of the present invention.

[0016] Figure 4 It is a front view of the present invention cut along the center of the draw cord on the front side.

[0017] Figure 5 It is a front view of the present invention cut perpendicularly to the transmission shaft.

[0018] Figure 6 It is a cutaway front view of the present invention.

[0019] Figure 7 It is a front view of the present invention cut perpendicularly to the operating axis.

[0020] Figure 8 It is a left side view cut along the center of the operating shaft, hand wheel and positioning rod in the present invention.

[0021] Fig. 9 It is a cutaway top view of a flat plate in the present invention.

[0022] Fig.10 It is the cutaway left view of the present invention.

[0023] Fig.11 The present invention Fig.10 Enlarged views of points A and B in the middle.

[0024] Fig.12 It is an axonometric view after removing the base, the swing plate and the flat plate in the present invention.

[0025] Fig.13 It is an axonometric view of the rectangular rod and the short axis in the present invention.

[0026] Fig.14 It is a state diagram of the present invention after folding. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0028] Depend on Figures 1 to 14The invention discloses a base 1, which comprises a storage groove with an opening facing upward and the left side connected to the outside world. A swing plate 2 is hingedly connected to the left side of the storage groove through a hinge shaft in the front-rear axial direction. A rotating shaft 3 in the front-rear axial direction is rotatably connected to the right side of the storage groove. A first swing rod 4 is fixed to the front and rear sides of the rotating shaft 3 respectively. A second swing rod 5 is hingedly connected to the upper end of the first swing rod 4. A transmission shaft 6 in the front-rear axial direction is rotatably connected to the right side of the swing plate 2. The upper ends of the two second swing rods 5 are respectively fixedly connected to the transmission shaft 6. An empty groove 7 with an opening away from the base 1 is opened on the swing plate 2. A swing groove 8 is connected downwardly to the front and rear sides of the empty groove 7 respectively. Two supporting shafts 9 in the front-rear axial direction and opposite to each other on the left and right sides are rotatably connected in the two swing grooves 8. The supporting shaft 9 on the right side can rotate with the transmission shaft 6. The rotation direction of the supporting shaft 9 is opposite to that of the transmission shaft 6. A rectangular cylinder 10 with an opening facing upward is fixed to the opposite sides of each two supporting shafts 9 in the front-rear axial direction respectively. A rectangular rod 11 is slidably connected in the rectangular cylinder 10. A flat plate 12 is hingedly connected to the upper ends of the plurality of rectangular rods 11.

[0029] The length between the left and right ends of the empty slot 7 and the length of the swing slot 8 are both greater than the width of the flat plate 12. A through slot 13 with an opening facing downward is connected to the left side of the empty slot 7. A box body 14 with an upper opening connected to the through slot 13 is fixed to the lower side of the swing plate 2. A slide plate 15 is provided in the through slot 13, which can move up and down as the support shaft 9 on the left side rotates. Soft pads 16 are fixed to the upper surfaces of the slide plate 15, the upper surfaces of the swing plate 2 and the upper surfaces of the flat plate 12.

[0030] In order to allow the rotating shaft 3 to rotate, a clearance groove is provided on the base 1, and a horizontal bar 17 is slidably connected to the clearance groove in the left and right directions. A plurality of first tooth grooves 18 with openings facing upward are provided on the right side of the horizontal bar 17, and a plurality of second tooth grooves 19 with openings facing downward are provided on the left side thereof. The front end of the rotating shaft 3 extends into the clearance groove and is fixed with a first gear 20 meshing with the first tooth groove 18. An operating shaft 21 with a front-to-rear axial direction is rotatably connected in the clearance groove, and a second gear 22 meshing with the second tooth groove 19 is fixed on the operating shaft 21.

[0031] In order to facilitate the rotation of the operating shaft 21 and limit the angle of the swing plate 2, the front end of the operating shaft 21 extends out of the base 1 and is slidably connected to a handwheel 23. The base 1 is provided with a plurality of positioning holes 24 distributed along the circumferential direction of the operating shaft 21. A plurality of positioning rods 25 distributed along the circumferential direction of the handwheel 23 are fixed on the rear end surface of the handwheel 23, and the positioning rods 25 can be inserted into the positioning holes 24.

[0032] In order to achieve sliding connection between the hand wheel 23 and the operating shaft 21 , guide grooves 26 are respectively provided on the upper and lower sides of the hand wheel 23 , and guide blocks 27 are respectively fixed on the upper and lower sides of the operating shaft 21 , and the guide blocks 27 are located in the guide grooves 26 .

[0033] In order to facilitate the storage of the swing plate 2 and the folding of the first swing rod 4 and the second swing rod 5, the front and rear sides of the swing plate 2 are respectively provided with inclined grooves 28 which are lower on the left and higher on the right and open downward, and the second swing rod 5 is located in the corresponding inclined grooves 28.

[0034] In order to enable the support shaft 9 on the right side to rotate with the transmission shaft 6, the opposite sides of the two swing grooves 8 are connected to the inclined groove 28 on the corresponding side through connecting grooves, and the first intermittent gears 29 are fixed on the front and rear sides of the transmission shaft 6, and the opposite sides of the two support shafts 9 on the right side are fixed with second intermittent gears 30 that can mesh with the first intermittent gears 29. The tooth top circle diameter of the second intermittent gear 30 is smaller than the tooth top circle diameter of the first intermittent gear 29. A locking block 31 is fixed on the outer edge surface of the second intermittent gear 30, and the free end of the locking block 31 is an arc surface, and the radius of the arc surface is slightly larger than the radius of the tooth root circle of the first intermittent gear 29.

[0035] In order to enable the rectangular rod 11 to slide in the rectangular tube 10, and the flat plate 12 is hingedly connected to the multiple rectangular rods 11, the four corners of the lower end of the flat plate 12 are respectively fixed with inverted U-shaped ears 32 that pass through the left and right sides, and a short shaft 33 is fixed in each ear 32. The upper end of the rectangular rod 11 is rotatably connected to the short shaft 33 on the corresponding side. The left side wall of the rectangular tube 10 is provided with multiple limit grooves 34 distributed in the up and down directions, and a transverse groove is provided on the left side of each rectangular rod 11. The bottom of the transverse groove is connected to a limit block 36 via a compression spring 35, and the limit block 36 can be inserted into the corresponding limit groove 34.

[0036] In order to facilitate the movement of the limit block 36, a diamond-shaped groove in the front-to-back direction is opened on the swing plate 2, and a winding shaft 37 is rotatably connected in the diamond-shaped groove. The front end of the winding shaft 37 extends out of the swing plate 2 and is fixed with a knob. A first D-shaped groove 38 is opened on the upper end of each rectangular rod 11, and a second D-shaped groove 39 located in the corresponding first D-shaped groove 38 is opened on each short shaft 33. A pull rope 40 is fixed to the right end of each positioning block, and the free end of the pull rope 40 passes through the rectangular rod 11, the first D-shaped groove 38, the second D-shaped groove 39 and the flat plate 12 in sequence and is fixedly connected to the winding shaft 37.

[0037] In order to enable the slide plate 15 to slide up and down as the support shaft 9 on the left side rotates, the two support shafts 9 on the left side are fixedly connected via a connecting shaft 41, a transmission gear 42 is fixed on the connecting shaft 41, and a transmission rack 43 meshing with the transmission gear 42 is fixed at the right end of the slide plate 15.

[0038] In order to facilitate observation of the swing angle of the swing plate 2, an angle plate 44 coaxial with the hinge shaft is fixed on the front side of the swing plate 2, and an angle line and angle value are provided on the angle plate 44. A notch 45 is provided on the front side of the base 1, and the bottom of the notch 45 is a horizontal plane and is coplanar with the axis of the hinge shaft.

[0039] In order to facilitate the storage of the box body 14 on the base 1, the lower side of the storage groove is connected to a receiving groove.

[0040] In order to fold the swing plate 2 in the base 1 to the maximum extent, the length of the second swing rod 5 is slightly greater than that of the first swing rod 4 .

[0041] In order to make room for the angle plate, an arc groove is provided on the base 1.

[0042] When the present invention is in use, the first swing rod 4, the second swing rod 5 and the swing plate 2 are in a folded state, the two rectangular tubes 10 are swung to be flush with the swing plate 2, the compression spring 35 is not compressed, and the distance between the free end of the rectangular rod 11 and the rectangular tube 10 is the largest in the initial state (refer to the attached figure of the specification). Fig.14 );

[0043] When the patient needs to raise his upper body, the patient places the base 1 on the bed board and pulls the hand wheel 23 forward. The hand wheel 23 drives the positioning rod 25 and the guide block 27 to move forward. After the positioning rod 25 is completely out of the positioning hole 24, the hand wheel 23 is turned counterclockwise. The hand wheel 23 drives the operating shaft 21 to rotate counterclockwise through the guide block 27, so that the second gear 22 is engaged with the second tooth groove 19 to drive the cross bar 17 to move left, and then the first tooth groove 18 is engaged with the first gear 20 to make the rotating shaft 3 rotate clockwise. The rotating shaft 3 drives the two first swing rods 4 to rotate clockwise, so that the two second swing rods 5 swing around the hinge point with the first swing rod 4, and the upper ends of the two second swing rods 5 drive the transmission shaft 6 and the first intermittent gear 29 to rotate counterclockwise. The first intermittent gear 29 rotates with the second intermittent gear 30. Since the tooth top circle diameter of the second intermittent gear 30 is smaller than that of the first intermittent gear 30, the rotation of the first intermittent gear 30 is relatively stable. The tooth top circle diameter of the gear 29, therefore, the second intermittent gear 30 quickly drives the right support shaft 9 to rotate clockwise, and because the four rectangular cylinders 10, the rectangular rod 11 and the plate 12 form a parallel four-bar linkage, the four rectangular cylinders 10 drive the rectangular rod 11 and the plate 12 to swing right, and the plate 12 always remains parallel to the swing plate 2. When the rectangular cylinder 10 swings to be perpendicular to the swing plate 2, the second intermittent gear 30 is disengaged from the first intermittent gear 29, and the cooperation between the arc surface of the locking block 31 and the outer edge surface of the tooth root circle of the first intermittent gear 29 prevents the second intermittent gear 30 from rotating in the opposite direction. Therefore, after the first intermittent gear 29 is engaged with the second intermittent gear 30 to make the plate 12 fully unfolded, no matter how much the second swing rod 5 drives the intermittent gear to rotate, that is, how much the swing plate 2 drives, the plate 12 always remains perpendicular to the rectangular rod 11.

[0044] When the support shaft 9 on the left side rotates clockwise, the two support shafts 9 on the left side drive the connecting shaft 41 and the transmission gear 42 to rotate, the transmission gear 42 meshes with the transmission gear 42 and drives the slide plate 15 to move upward, and the slide plate 15 drives the soft pad 16 to move upward until it is flush with the upper surface of the soft pad 16 adjacent to it;

[0045] The patient observes the angle line and angle value on the angle plate 4544 and the flush state with the bottom surface of the notch to determine the swing angle of the swing plate 2. When the swing angle of the swing plate 2 meets the height of the patient's upper body, the hand wheel 23 is stopped and pressed backward so that the multiple positioning rods 25 are inserted into the corresponding positioning holes 24 to position the hand wheel 23 and the operating shaft 21 to ensure the stability of the flat plate 12. The arranging device is in the unfolded state (refer to the attached figure of the specification) Figure 1 ).

[0046] The patient's upper body lies on the swing board 2, and the head is placed on the cushion 16 on the flat board 12. The height of the flat board 12 can be adjusted according to the commonly used pillow height. The knob is turned, and the knob drives the winding shaft 37 to rotate, and four pull ropes 40 are wound around the winding shaft 37 at the same time, so that the pull rope 40 pulls the limit block 36 out of the limit groove 34 and compresses the compression spring 35, and keeps the current state to press the flat board 12 downward, and the flat board 12 drives the multiple rectangular rods 11 to move downward. When the patient feels that the height of the flat board 12 meets his own needs, he stops pressing the flat board 12 downward and loosens the knob. The multiple pull ropes 40 become loose under the action of the compression spring 35, and the fibers can be inserted into the corresponding limit grooves 34. The winding shaft 37 is reversed and reset, so that the flat board 12 maintains the adjusted height (refer to the attached drawings in the specification). Figure 4 ).

[0047] When the use is over and the swing plate 2, the first swing rod 4, the second swing rod 5 and the flat plate 12 need to be folded and stored, the hand wheel 23 is pulled forward, and the hand wheel 23 drives the positioning rod 25 and the guide block 27 to move forward. After the positioning rod 25 is completely out of the positioning hole 24, the hand wheel 23 is turned clockwise, and the hand wheel 23 drives the operating shaft 21 to rotate clockwise through the guide block 27, so that the second gear 22 is engaged with the second tooth groove 19 to drive the cross bar 17 to move right, and then the first tooth groove 18 is engaged with the first gear 20 to make the rotating shaft 3 rotate counterclockwise, and the rotating shaft 3 drives the two first swing rods 4 to rotate counterclockwise, so that the two second swing rods 5 swing around the hinge point with the first swing rod 4, and the upper ends of the two second swing rods 5 drive the transmission shaft 6 and the first intermittent gear 29 to rotate clockwise. When the first intermittent gear 29 rotates to When meshing with the second intermittent gear 30, the second intermittent gear 30 drives the rectangular tube 10 on the right side to rotate counterclockwise via the support shaft 9. Since the four rectangular tubes 10, the rectangular rods 11 and the flat plate 12 form a parallel four-bar linkage, the four rectangular tubes 10 drive the rectangular rods 11 and the flat plate 12 to swing leftward. At the same time, the two support shafts 9 on the left side drive the transmission gear 42 to rotate counterclockwise via the connecting shaft 41, so that the transmission gear 42 meshes with the transmission rack 43 and drives the slide plate 15 to move downward, and the slide plate 15 drives the soft pad 16 thereon to move downward. When the slide plate 15 moves downward into the box body 14 and the soft pad 16 on the slide plate 15 slides into the through groove 13, the rectangular tube 10 swings into the empty groove 7. At this time, the swing plate 2 swings to the initial state, that is, the entire device is in a folded and stored state (refer to the attached drawings in the specification). Fig.14 ), press the hand wheel 23 backward, and insert the positioning rod 25 into the positioning hole 24 to ensure the stability of the device when it is in the folded state.

[0048] In the present invention, the first D-shaped groove 38 and the second D-shaped groove 39 are provided to make way for the pull rope 40 when the flat plate 12 and the rectangular rod 11 are in a folded parallel state, so as to prevent the pull rope 40 from being tightened, causing the limit block 36 to escape from the limit groove 34. When carrying and moving the device, the rectangular rod 11 slides in the rectangular tube 10, generating noise, which affects carrying and storage.

Claims

1. A support frame, comprising a base (1), characterized in that: The base (1) is provided with a storage groove with an opening facing upward and a left side connected to the outside. The left side of the storage groove is hingedly connected to a swing plate (2) via a hinged shaft in the front and rear axial direction. The right side of the storage groove is rotatably connected to a rotating shaft (3) in the front and rear axial direction. First swing rods (4) are respectively fixed to the front and rear sides of the rotating shaft (3). The upper end of the first swing rod (4) is hingedly connected to a second swing rod (5). The right side of the swing plate (2) is rotatably connected to a transmission shaft (6) in the front and rear axial direction. The upper ends of the two second swing rods (5) are respectively fixedly connected to the transmission shaft (6). The swing plate (2) is provided with an opening away from the base (1). A slot (7), the front and rear sides of the empty slot (7) are respectively connected downwardly with swing slots (8), two left-right opposite and front-back axial support shafts (9) are respectively rotatably connected in the two swing slots (8), the right support shaft (9) can rotate along with the transmission shaft (6), the support shaft (9) and the transmission shaft (6) rotate in opposite directions, a rectangular cylinder (10) with an opening facing upward is respectively fixed on the opposite sides of each of the two front-back opposite support shafts (9), a rectangular rod (11) is slidably connected in the rectangular cylinder (10), and the upper ends of the plurality of rectangular rods (11) are hingedly connected to a flat plate (12); The length between the left and right ends of the empty slot (7) and the length of the swing slot (8) are both greater than the width of the plate (12). The left side of the empty slot (7) is connected to a through slot (13) with an opening facing downward. A box body (14) whose upper opening is connected to the through slot (13) is fixed to the lower side of the swing plate (2). A slide plate (15) is provided in the through slot (13) and can move up and down with the rotation of the left support shaft (9). Soft pads (16) are fixed to the upper surfaces of the slide plate (15), the swing plate (2) and the plate (12).

2. A support frame according to claim 1, characterized in that: The base (1) is provided with a clearance groove, in which a horizontal bar (17) is slidably connected in the clearance groove, a plurality of first tooth grooves (18) with openings facing upward are provided on the right side of the horizontal bar (17), and a plurality of second tooth grooves (19) with openings facing downward are provided on the left side thereof, the front end of the rotating shaft (3) extends into the clearance groove and is fixed with a first gear (20) meshing with the first tooth groove (18), an operating shaft (21) in a front-rear axial direction is rotatably connected in the clearance groove, and a second gear (22) meshing with the second tooth groove (19) is fixed on the operating shaft (21).

3. A support frame according to claim 2, characterized in that: The front end of the operating shaft (21) extends out of the base (1) and is slidably connected to a hand wheel (23). The base (1) is provided with a plurality of positioning holes (24) distributed along the circumference of the operating shaft (21). A plurality of positioning rods (25) distributed along the circumference of the hand wheel (23) are fixed to the rear end surface thereof. The positioning rods (25) can be inserted into the positioning holes (24).

4. A support frame according to claim 3, characterized in that: The hand wheel (23) is provided with guide grooves (26) on the upper and lower sides respectively, and the operating shaft (21) is fixed with guide blocks (27) on the upper and lower sides respectively, and the guide blocks (27) are located in the guide grooves (26).

5. A support frame according to claim 1, characterized in that: The front and rear sides of the swing plate (2) are respectively provided with oblique grooves (28) which are lower on the left and higher on the right and open downwards, and the second swing rod (5) is located in the corresponding oblique grooves (28).

6. A support frame according to claim 1, characterized in that: The opposite sides of the two swing grooves (8) are connected to the corresponding side oblique grooves (28) via connecting grooves, and first intermittent gears (29) are fixed to the front and rear sides of the transmission shaft (6), and second intermittent gears (30) that can mesh with the first intermittent gears (29) are fixed to the opposite sides of the two support shafts (9) on the right side, respectively. The diameter of the tooth top circle of the second intermittent gear (30) is smaller than the diameter of the tooth top circle of the first intermittent gear (29), and a locking block (31) is fixed to the outer edge surface of the second intermittent gear (30), and the free end of the locking block (31) is an arc surface, and the radius of the arc surface is slightly larger than the radius of the tooth root circle of the first intermittent gear (29).

7. A support frame according to claim 1, characterized in that: The four corners of the lower end of the plate (12) are respectively fixed with inverted U-shaped ears (32) that penetrate left and right, each ear (32) is fixed with a short shaft (33), the upper end of the rectangular rod (11) is rotatably connected to the short shaft (33) on the corresponding side, the left side wall of the rectangular tube (10) is provided with a plurality of limit grooves (34) distributed in the up-down direction, each rectangular rod (11) is provided with a transverse groove on the left side, the bottom of the transverse groove is connected to a limit block (36) via a compression spring (35), and the limit block (36) can be inserted into the corresponding limit groove (34).

8. A support frame according to claim 1, characterized in that: The swing plate (2) is provided with a diamond-shaped groove in the front-to-back direction, a winding shaft (37) is rotatably connected in the diamond-shaped groove, the front end of the winding shaft (37) extends out of the swing plate (2) and is fixed with a knob, each rectangular rod (11) is provided with a first D-shaped groove (38) at the upper end, each short shaft (33) is provided with a second D-shaped groove (39) located in the corresponding first D-shaped groove (38), and a pull rope (40) is fixed to the right end of each positioning block, and the free end of the pull rope (40) passes through the rectangular rod (11), the first D-shaped groove (38-38), the second D-shaped groove (39) and the plate (12) in sequence upwards and is fixedly connected to the winding shaft (37).

9. A support frame according to claim 1, characterized in that: The two support shafts (9) on the left are fixedly connected via a connecting shaft (41), a transmission gear (42) is fixed on the connecting shaft (41), and a transmission rack (43) meshing with the transmission gear (42) is fixed on the right end of the slide plate (15).

10. A support frame according to claim 1, characterized in that: An angle plate (44) coaxial with the hinge shaft is fixed on the front side of the swing plate (2), an angle line and an angle value are provided on the angle plate (44), and a notch (45) is provided on the front side of the base (1), the bottom of the notch (45) is a horizontal plane and is coplanar with the axis of the hinge shaft.

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