Liftable teaching desk

Abstract

The utility model discloses a liftable teaching desk, which relates to the technical field of teaching desks, and comprises a desk plate, two upper desk legs and two lower desk legs, the bottom surface of the desk plate is fixed with the upper ends of the two upper desk legs, the lower ends of the upper desk legs are inserted into the upper ends of the lower desk legs in a sliding manner, and threaded shafts are inserted into the bottom surfaces of the upper desk legs in a threaded manner; the threaded shafts are rotationally inserted into the corresponding lower table legs, an inner shaft is arranged between the two lower table legs, the two ends of the inner shaft rotationally penetrate through the faces, close to each other, of the two lower table legs respectively, the middle of the inner shaft is rotationally sleeved with a fixing shaft, and the middle of the fixing shaft is fixed to the two lower table legs. The table is reasonable in design structure, the pedal can be pushed to drive the inner edge sleeve and the two edge shafts to be matched through the pedal, the edge shafts, the one-way transmission structures and other components, the inner shaft is driven to rotate forwards and backwards through the two one-way transmission structures, and the two upper table legs are meshed with the two threaded shafts to change the height of the table plate.

Description

Technical Field

[0001] This utility model relates to the field of teaching desk technology, specifically a height-adjustable teaching desk. Background Technology

[0002] Height-adjustable desks: also known as adjustable desks, as the name suggests, are desks and chairs whose height can be adjusted. The height of the desk can be adjusted by adjusting the relevant fasteners on the legs between the sliding hinges, thereby meeting the needs of schools and students.

[0003] Most existing height-adjustable desks are manufactured with holes for different heights. Adjusting screws are passed through these holes to connect the desk legs, thus adjusting the desk height. This process is rather cumbersome. While some desks now use electrical mechanisms for extension and retraction, these require internal power, posing a safety hazard and increasing the risk of accidental injury to students' legs. Therefore, we offer a height-adjustable teaching desk to solve these problems. Utility Model Content

[0004] 1) Technical problems to be solved

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a height-adjustable teaching desk.

[0006] (ii) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a height-adjustable teaching desk, comprising a tabletop, two upper table legs, and two lower table legs. The bottom surface of the tabletop is fixed to the upper ends of the two upper table legs. The lower ends of the upper table legs are slidably inserted into the upper ends of the lower table legs. A threaded shaft is threadedly inserted into the bottom surface of each upper table leg, and the threaded shaft is rotatably inserted into the interior of the corresponding lower table leg. An inner shaft is provided between the two lower table legs, with both ends of the inner shaft rotatably penetrating the adjacent surfaces of the two lower table legs. The middle part of the inner shaft is rotatably sleeved... There is a fixed shaft, the middle part of which is fixed to the two lower table legs. A foot pedal is set above the fixed shaft. Two inner rib sleeves are fixed on the bottom surface of the foot pedal. Rib shafts are rotatably sleeved on the outer surface of the inner shaft and on both sides of the fixed shaft. One-way transmission structures are installed at the ends of the two rib shafts that are far apart from each other. The other end of the one-way transmission structure is connected to the inner shaft. A bevel gear A is fixedly sleeved at the end of the inner shaft inside the lower table legs. A bevel gear B meshes above the bevel gear A. The bevel gear B is fixedly sleeved at the lower end of the adjacent threaded shaft.

[0008] Furthermore, the middle part of the fixed shaft is fixedly connected to the two lower table legs by a vertical rod and a horizontal rod. The upper end of the vertical rod is fixedly sleeved on the middle part of the fixed shaft, the lower end of the vertical rod is fixed to the upper surface of the horizontal rod, and the two ends of the horizontal rod are respectively fixed to the two lower table legs.

[0009] Furthermore, the unidirectional transmission structure includes a grooved disc and a disc. The disc is fixedly sleeved on the outer surface of an adjacent prism, and the grooved disc is fixedly sleeved on the outer surface of an inner shaft. The side of the grooved disc near the disc is an annular groove. Multiple partitions are fixedly inserted into the annular groove of the grooved disc. Multiple levers are elastically rotatably connected to the side of the disc near the grooved disc. A stop bar is provided on one side of the lever, and the stop bar is fixed to the disc.

[0010] Furthermore, multiple partitions and multiple levers are evenly distributed in a circular array around the inner axis, and the number of partitions is an integer multiple of the number of levers.

[0011] Furthermore, the stop levers located on both sides of the fixed shaft are in opposite positions to the lever, and the disc, grooved disc, inner shaft, prism shaft and fixed shaft are coaxially arranged.

[0012] Furthermore, the lower table legs are in the shape of an inverted T, with the two lower table legs coaxial with the two upper table legs respectively, the crossbar parallel to the inner axis, and the two lower table legs symmetrically distributed about the axis of the upright.

[0013] Furthermore, the fixed shaft is prism-shaped at one end inside the two inner sleeves, and cylindrical at the other end outside the inner sleeves.

[0014] (iii) Beneficial effects:

[0015] Compared with existing technologies, this height-adjustable teaching desk has the following advantages:

[0016] I. This utility model, by setting up components such as pedals, prism shafts, and one-way transmission structures, allows the inner prism sleeve and two prism shafts to be engaged when the height of the table needs to be changed. When the two prism shafts rotate, they drive the inner shaft to rotate in both directions through two one-way transmission structures. The inner shaft drives two threaded shafts to rotate in both directions through the meshing of bevel gears A and B. The two upper table legs mesh with the two threaded shafts to change the height of the table.

[0017] Second, this utility model uses a prism end that engages with two inner prism sleeves on the surface of a fixed shaft. When the height of the table does not need to be changed, the pedal is controlled to drive the inner prism sleeves to engage with the prism end of the fixed shaft, thus fixing the angle of the pedal, supporting the student's feet, and improving the comfort of the student's feet. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram showing the connection between the pedal and the inner sleeve of this utility model;

[0020] Figure 3 This is a front view schematic diagram of part of the structure of this utility model;

[0021] Figure 4 This is a schematic diagram showing the connection between the fixed shaft and the inner shaft of this utility model;

[0022] Figure 5 This is a schematic diagram showing the connection between the partition plate and the grooved ring of this utility model;

[0023] Figure 6 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0024] In the diagram: 1. Tabletop; 2. Upper table leg; 3. Lower table leg; 4. One-way transmission structure; 41. Grooved plate; 42. Disc; 43. Partition; 44. Stop bar; 45. Lever; 5. Inner shaft; 6. Fixed shaft; 7. Inner rib sleeve; 8. Pedal; 9. Rib shaft; 10. Bevel gear A; 11. Bevel gear B; 12. Threaded shaft; 13. Upright pole; 14. Crossbar. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 1-6 As shown, this utility model provides a technical solution: a height-adjustable teaching desk, including a tabletop 1, two upper table legs 2 and two lower table legs 3. The bottom surface of the tabletop 1 is fixed to the upper ends of the two upper table legs 2. The lower ends of the upper table legs 2 are slidably inserted into the upper ends of the lower table legs 3. A threaded shaft 12 is threadedly inserted into the bottom surface of the upper table legs 2. The threaded shaft 12 is rotatably inserted into the interior of the corresponding lower table legs 3. When the threaded shaft 12 rotates, it can change the height of the tabletop 1 by meshing with the upper table legs 2.

[0027] An inner shaft 5 is provided between the two lower table legs 3. The two ends of the inner shaft 5 rotatably pass through the sides of the two lower table legs 3 that are close to each other. A fixed shaft 6 is rotatably sleeved in the middle of the inner shaft 5. The middle part of the fixed shaft 6 is fixed to the two lower table legs 3. The middle part of the fixed shaft 6 is fixedly connected to the two lower table legs 3 through a vertical rod 13 and a horizontal rod 14. The upper end of the vertical rod 13 is fixedly sleeved in the middle of the fixed shaft 6. The lower end of the vertical rod 13 is fixed to the upper surface of the horizontal rod 14. The two ends of the horizontal rod 14 are fixed to the two lower table legs 3 respectively, so that the two ends of the fixed shaft 6 are in a suspended state. The shape of the lower table legs 3 is inverted T-shaped. The two lower table legs 3 are coaxially arranged with the two upper table legs 2 respectively. The horizontal rod 14 is parallel to the inner shaft 5. The two lower table legs 3 are symmetrically distributed about the axis of the vertical rod 13.

[0028] A pedal 8 is provided above the fixed shaft 6. Two inner prism sleeves 7 are fixed on the bottom surface of the pedal 8. One end of the fixed shaft 6 located inside the two inner prism sleeves 7 is a mating prism shape, and the part of the fixed shaft 6 located outside the inner prism sleeves 7 is cylindrical. The outer surface of the inner shaft 5 and the left and right sides of the fixed shaft 6 are rotatably fitted with prism shafts 9. When the inner prism sleeve 7 and the prism end of the fixed shaft 6 are mated, the angle of the pedal 8 is fixed. When the inner prism sleeve 7 moves to mate with the prism shaft 9, it can drive the prism shaft 9 to rotate. At the same time, the other inner prism sleeve 7 moves to the cylindrical end of the fixed shaft 6, so that the inner prism sleeve 7 can rotate.

[0029] One-way transmission structure 4 is installed at the ends of the two prisms 9 that are far apart from each other. The other end of the one-way transmission structure 4 is connected to the inner shaft 5. The rotational forces transmitted by the two one-way transmission structures 4 are in different directions.

[0030] The unidirectional transmission structure 4 includes a grooved disc 41 and a disc 42. The disc 42 is fixedly sleeved on the outer surface of the adjacent prism 9, and the grooved disc 41 is fixedly sleeved on the outer surface of the inner shaft 5. The side of the grooved disc 41 near the disc 42 is an annular groove. Multiple partitions 43 are fixedly inserted into the annular groove of the grooved disc 41. Multiple levers 45 are elastically rotatably connected to the side of the disc 42 near the grooved disc 41. The multiple partitions 43 and multiple levers 45 are evenly distributed in a circumferential array around the axis of the inner shaft 5. The number of 3 is an integer multiple of the number of levers 45. A stop bar 44 is provided on one side of the lever 45. The stop bar 44 is fixed to the disc 42. When the prism 9 drives the lever 45 to apply a pushing force through the disc 42, when the lever 45 contacts the stop bar 44 to apply force, the disc 42 pushes the lever 45 through the stop bar 44 to drive the partition 43, the grooved disc 41 and the inner shaft 5 to rotate synchronously. When the rotation direction of the disc 42 drives the lever 45 to rotate to the other side, the lever 45 rotates relative to the partition 43.

[0031] The stop levers 44 located on both sides of the fixed shaft 6 are in opposite positions to the lever 45, so that when the two prism shafts 9 rotate in opposite directions, they drive the inner shaft 5 to rotate in opposite directions. The disc 42, the grooved disc 41, the inner shaft 5, the prism shaft 9 and the fixed shaft 6 are coaxially arranged.

[0032] The inner shaft 5 is fixedly sleeved with a bevel gear A10 at one end inside the lower table leg 3. A bevel gear B11 meshes above the bevel gear A10. The bevel gear B11 is fixedly sleeved at the lower end of the adjacent threaded shaft 12. The inner shaft 5 drives the threaded shaft 12 to rotate through the meshing of the bevel gear A10 and the bevel gear B11.

[0033] Working principle: When the height of the tabletop 1 needs to be changed, the pedal 8 is pushed to drive the inner prism sleeve 7 and the two prism shafts 9 to cooperate. At the same time, the inner prism sleeve 7 on the other side disengages from the prism end of the fixed shaft 6, so that the pedal 8 can drive the corresponding prism shaft 9 to rotate through the inner prism sleeve 7. When the two prism shafts 9 rotate, since the stop levers 44 on both sides are located in different positions of the lever 45, the two prism shafts 9 apply a pushing force to the lever 45 in the groove plate 41 through the lever 45, which drives the inner shaft 5 to rotate in both directions. The inner shaft 5 drives the threaded shaft 12 to rotate in both directions through the meshing of bevel gear A10 and bevel gear B11. When the upper table leg 2 meshes with the threaded shaft 12 rotating in both directions, the height of the tabletop 1 can be controlled.

Claims

1. A height-adjustable teaching desk, comprising a tabletop (1), two upper table legs (2) and two lower table legs (3), characterized in that: The bottom surface of the tabletop (1) is fixed to the upper ends of the two upper table legs (2). The lower ends of the upper table legs (2) are slidably inserted into the upper ends of the lower table legs (3). A threaded shaft (12) is threaded into the bottom surface of the upper table legs (2). The threaded shaft (12) is rotatably inserted into the interior of the corresponding lower table legs (3). An inner shaft (5) is provided between the two lower table legs (3). The two ends of the inner shaft (5) rotatably pass through the side of the two lower table legs (3) that are close to each other. A fixed shaft (6) is rotatably sleeved in the middle part of the inner shaft (5). The middle part of the fixed shaft (6) is fixed to the two lower table legs (3). A footboard (8) is provided on the top. Two inner rib sleeves (7) are fixed on the bottom surface of the footboard (8). Rib shafts (9) are rotatably sleeved on the outer surface of the inner shaft (5) and on both sides of the fixed shaft (6). One-way transmission structure (4) is installed at the ends of the two rib shafts (9) that are far apart from each other. The other end of the one-way transmission structure (4) is connected to the inner shaft (5). A bevel gear A (10) is fixedly sleeved at the end of the inner shaft (5) located inside the lower table leg (3). A bevel gear B (11) meshes above the bevel gear A (10). The bevel gear B (11) is fixedly sleeved at the lower end of the adjacent threaded shaft (12).

2. The height-adjustable teaching desk according to claim 1, characterized in that: The middle part of the fixed shaft (6) is fixedly connected to the two lower table legs (3) through the upright (13) and the crossbar (14). The upper end of the upright (13) is fixedly sleeved on the middle part of the fixed shaft (6), the lower end of the upright (13) is fixed to the upper surface of the crossbar (14), and the two ends of the crossbar (14) are fixed to the two lower table legs (3) respectively.

3. The height-adjustable teaching desk according to claim 1, characterized in that: The unidirectional transmission structure (4) includes a grooved disc (41) and a disc (42). The disc (42) is fixedly sleeved on the outer surface of the adjacent prism (9). The grooved disc (41) is fixedly sleeved on the outer surface of the inner shaft (5). The side of the grooved disc (41) near the disc (42) is an annular groove. Multiple partitions (43) are fixedly inserted inside the annular groove of the grooved disc (41). Multiple levers (45) are elastically rotatably connected to the side of the disc (42) near the grooved disc (41). A stop bar (44) is provided on one side of the lever (45). The stop bar (44) is fixed to the disc (42).

4. The height-adjustable teaching desk according to claim 3, characterized in that: Multiple partitions (43) and multiple levers (45) are evenly distributed in a circular array around the axis of the inner shaft (5), and the number of partitions (43) is an integer multiple of the number of levers (45).

5. The height-adjustable teaching desk according to claim 3, characterized in that: The stop bars (44) located on both sides of the fixed shaft (6) are in opposite positions to the lever (45). The disc (42), the grooved disc (41), the inner shaft (5), the prism shaft (9) and the fixed shaft (6) are coaxially arranged.

6. The height-adjustable teaching desk according to claim 2, characterized in that: The lower table leg (3) is in the shape of an inverted T. The two lower table legs (3) are coaxially arranged with the two upper table legs (2) respectively. The crossbar (14) is parallel to the inner axis (5). The two lower table legs (3) are symmetrically distributed with respect to the axis of the upright (13).

7. The height-adjustable teaching desk according to claim 1, characterized in that: The fixed shaft (6) is located inside the two inner sleeves (7) at one end, which is a prism shape that fits, and the part of the fixed shaft (6) located outside the inner sleeves (7) is cylindrical.

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