A movable desk convenient for class collective activities

Abstract

The present invention relates to a movable desk, and in particular to a movable desk that is convenient for class collective activities. The present invention provides a movable desk that is convenient for class collective activities, which is movable and fixable and can simultaneously lower the height of the desk when switching the moving function. A movable desk that is convenient for class collective activities includes a support leg, a connecting rod, a first sliding rod, a frame, screws, etc., the number of the support legs is two, a connecting rod is connected between the two support legs, the upper parts of the support legs are all slidably provided with a first sliding rod, the tops of the first sliding rods are connected with a frame, the upper parts of the support legs are all threaded with screws with a tightening function, and the inner ends of the screws are in contact with the first sliding rod on the same side. By controlling the extension of the telescopic end of the electric push rod, the wheels move downward to contact the ground, the support legs are separated from the ground, and under the rolling cooperation of the wheels, the desk can be easily moved on the ground.

Description

Technical Field

[0001] The invention relates to a movable desk, in particular to a movable desk which is convenient for class collective activities. Background Art

[0002] Schools often organize various class group activities to enrich the school's learning life and improve class cohesion. Many kinds of class group activities require desks, and some activities also require the desks to be moved outdoors. The desks are bulky because they are filled with books, and in order to facilitate learning, traditional desks do not have wheels, so it is more difficult to move them, especially when going up and down stairs, the desk surface is high and difficult to carry.

[0003] Patent application CN203207507U discloses a retractable and splicable mobile desk, including a desktop, retractable legs, splicing interfaces, fixed legs, and rollers, wherein the desktop is mounted on the retractable legs, the retractable legs are connected to the fixed legs, rollers are mounted under the fixed legs, and splicing interfaces are mounted on the tops of the fixed legs. The mobile desk can adjust the height of the desktop through the retractable legs, and can adjust the height of the desk according to differences in individual height and sitting height; rollers are installed at the bottom for easy movement, and the splicing interfaces can be used to achieve splicing between multiple tables. However, the moving function and the lifting function of this mobile desk are independent of each other, and the rollers cannot be folded up, so the desk cannot be fixed, which makes the desk easy to move during study.

[0004] Based on the defects of existing movable desks, we designed a movable desk that can be moved and fixed and can simultaneously lower the height of the desk when switching the mobile function, which is convenient for class collective activities. Summary of the invention

[0005] In order to overcome the shortcomings of existing movable desks that they cannot be fixed and the moving function and the lifting function are independent of each other, the technical problem of the present invention is to provide a movable desk that is movable and fixable and can simultaneously lower the height of the desk when switching the moving function, which is convenient for class collective activities.

[0006] The technical implementation scheme of the present invention is: a movable desk that is convenient for class collective activities, including supporting legs, connecting rods, first sliding rods, frames, screws, moving mechanisms and locking mechanisms. There are two supporting legs, a connecting rod is connected between the two supporting legs, the upper parts of the supporting legs are all slidably provided with first sliding rods, a frame is connected between the tops of the first sliding rods, the upper parts of the supporting legs are all threadedly provided with screws with a tightening function, the inner ends of the screws are in contact with the first sliding rods on the same side, a moving mechanism that is convenient for driving the desk to move on a plane is connected between the connecting rods and the supporting legs, and the moving mechanism is provided with a locking mechanism that can lower the height of the desk to facilitate moving the desk.

[0007] More preferably, an electric push rod, a moving block, a first slide bar, a connecting block and wheels constitute a moving mechanism, an electric push rod is installed in the middle of the connecting rod, the telescopic end of the electric push rod is provided with a moving block slidably connected to the support foot, first slide bars are provided on the front and rear sides of the lower part of the support foot, connecting blocks are symmetrically provided on the left and right sides of the moving block, adjacent first slide bars are slidably connected to the connecting blocks, wheels are rotatably provided on the left and right sides of the lower part of the connecting block, and the support foot is located between the wheels on the same side.

[0008] More preferably, the second sliding bar, the wedge block, the touch block, the third sliding bar, the card block and the first spring constitute a locking mechanism, the left and right sides of the moving block are provided with second sliding bars slidably connected to the connecting rod, the top of the second sliding bar is provided with a wedge block, the inner side of the upper part of the support foot is provided with a third sliding bar, and a card block that is slidably engaged with the first sliding bar on the same side is provided between the support foot and the third sliding bar on the same side, and the lower part of the card block is provided with a touch block that contacts and cooperates with the wedge block on the same side, the third sliding bar is wound with a first spring, the inner end of the first spring is connected to the third sliding bar, and the outer end of the first spring is connected to the card block.

[0009] More preferably, it also includes a pulling mechanism for conveniently pushing the desk to move, and the pulling mechanism is composed of a support block, a first winding wheel, a first pull rope, a slide rail, a first rack, a first gear, a handle and a second spring. A support block is provided on the right rear side of the connecting rod, a first winding wheel is rotatably provided on the lower right rear side of the frame, a slide rail is provided in the middle of the lower rear part of the connecting rod, a first rack is slidably provided on the slide rail, a first pull rope is provided on the support block, the first pull rope is connected to the right end of the first rack, a handle is rotatably provided in the middle part of the rear side of the frame, a first gear meshing with the first rack is provided on the handle, and a second spring is connected between the left end of the first rack and the slide rail.

[0010] More preferably, it also includes a blocking mechanism to prevent books from falling out during movement, and the second winding wheel, the second pull rope, the first bracket, the third winding wheel, the second bracket, the baffle, the second gear, the sliding sleeve, the second rack and the third spring constitute the blocking mechanism, the second winding wheel is provided on the handle, and two second pull ropes are connected to the second winding wheel, the first bracket is provided on the rear of the left and right sides of the frame, the third winding wheel is rotatably provided on the rear side of the first bracket, the second bracket and the sliding sleeve located on the rear side of the second bracket are provided on the front of the left and right sides of the frame, the baffle for blocking the book is rotatably provided in the middle part of the second bracket, the second gear is provided on the front and lower part of the baffle, and the second rack is slidably provided on the outer side of the sliding sleeve, the second pull ropes are bypassed around the third winding wheel on the same side and are connected to the rear end of the second rack on the same side, the second gear and the second rack on the same side are meshed with each other, and the third spring is connected between the sliding sleeve on the same side and the rear side of the second rack.

[0011] More preferably, it also includes a pushing mechanism for convenient lifting of the desk, the pushing mechanism includes a hollow sleeve, a second sliding rod and a fourth spring, hollow sleeves are provided on the left and right sides of the top of the moving block, the upper part of the hollow sleeve is slidably provided with a second sliding rod for pushing the frame upward, and a fourth spring is connected between the bottom of the second sliding rod on the same side and the inside of the hollow sleeve.

[0012] More preferably, it also includes a flipping mechanism for facilitating the moving of the desk, the flipping mechanism includes a third bracket, a handle, a torsion spring and a stopper, a third bracket is provided in the middle of the upper part of the first sliding rod, a handle is rotatably provided on the third bracket, torsion springs are wound around the front and rear sides of the handle, the inner ends of the torsion springs are connected to the third bracket, the outer ends of the torsion springs are connected to the handle, and stops are provided on the front and rear sides of the upper part of the first sliding rod to limit the handle.

[0013] More preferably, two upper and lower slots are formed on the inner side of the first sliding rod.

[0014] The beneficial effects of the present invention are as follows: 1. By controlling the extension of the telescopic end of the electric push rod, the wheels move downward to contact the ground, and the legs are separated from the ground. With the rolling cooperation of the wheels, the desk can be easily moved on the ground;

[0015] 2. The moving block slides downward to drive the second slide bar to slide downward, so that the card block no longer blocks the card slot on the lower side of the first slide bar. Under the action of gravity, the first slide bar drives the frame to move downward, and the height of the desk is shortened, which is convenient for students to carry the desk when going up and down stairs, and enables students to easily carry the desk even on uneven ground;

[0016] 3. When the frame is lowered, the first rack drives the handle to swing upward to a vertical state through the first gear, and the student can move the desk on the ground by pushing the handle without bending over to push the desk;

[0017] 4. When the handle swings upward, the second rack drives the baffle to swing forward through the second gear, and the two baffles block the front side of the frame to prevent the books in the frame from leaning forward during the moving of the desk;

[0018] 5. The second sliding rod pushes the frame upward to raise a little distance, so that students can lift the frame more conveniently to prevent the card block from being re-stuck in the card slot on the upper part of the first sliding rod;

[0019] 6. Hold the two handles with both hands and turn them upwards. The torsion spring twists and deforms, and the upper part of the handle flips inward and downward and contacts the stopper to be limited. This makes it convenient for students to move the desks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention.

[0021] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0022] Figure 3 It is a schematic diagram of the second three-dimensional structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the moving mechanism of the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the locking mechanism of the present invention.

[0025] Figure 6 It is a partial three-dimensional structural schematic diagram of the locking mechanism of the present invention.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the pulling mechanism of the present invention.

[0027] Figure 8 It is a partial three-dimensional structural schematic diagram of the pulling mechanism of the present invention.

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the material blocking mechanism of the present invention.

[0029] Fig.10 It is a schematic diagram of the three-dimensional structure of the first part of the material blocking mechanism of the present invention.

[0030] Fig.11 It is a schematic diagram of the third part of the three-dimensional structure of the material blocking mechanism of the present invention.

[0031] Fig.12 It is a three-dimensional structural schematic diagram of the pushing mechanism of the present invention.

[0032] Fig.13 It is a partial three-dimensional structural schematic diagram of the pushing mechanism of the present invention.

[0033] Fig.14 It is a three-dimensional structural schematic diagram of the turning mechanism of the present invention.

[0034] Fig.15 It is a partial three-dimensional structural schematic diagram of the turning mechanism of the present invention.

[0035] The markings of the components in the accompanying drawings are as follows: 1_supporting foot, 2_connecting rod, 3_first sliding rod, 4_frame, 5_screw, 6_moving mechanism, 61_electric push rod, 62_moving block, 63_first sliding rod, 64_connecting block, 65_wheel, 7_locking mechanism, 71_second sliding rod, 72_wedge block, 73_touch block, 74_third sliding rod, 75_locking block, 76_first spring, 8_pulling mechanism, 81_supporting block, 82_first winding wheel, 83_first pull rope, 84_slide rail, 85_first rack, 86 _first gear, 87_handle, 88_second spring, 9_material blocking mechanism, 91_second winding wheel, 92_second pull rope, 93_first bracket, 94_third winding wheel, 95_second bracket, 96_baffle, 97_second gear, 98_sliding sleeve, 99_second rack, 910_third spring, 10_pushing mechanism, 101_hollow sleeve, 102_second sliding rod, 103_fourth spring, 11_flipping mechanism, 111_third bracket, 112_handle, 113_torsion spring, 114_block. DETAILED DESCRIPTION

[0036] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0037] Example 1

[0038] A movable desk that is convenient for class collective activities, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a support leg 1, a connecting rod 2, a first sliding rod 3, a frame 4, a screw 5, a moving mechanism 6 and a locking mechanism 7. There are two support legs 1, and a connecting rod 2 is provided between the two support legs 1 by riveting. The upper part of the support leg 1 is slidably provided with a first sliding rod 3, and the inner side of the first sliding rod 3 is provided with an upper and lower locking groove. The frame 4 is connected between the tops of the first sliding rods 3, and the upper part of the support leg 1 is threaded with screws 5. The inner ends of the screws 5 are in contact with the first sliding rod 3 on the same side. A moving mechanism 6 is connected between the connecting rod 2 and the support leg 1. The moving mechanism 6 is convenient for driving the desk to move on a plane. The moving mechanism 6 is provided with a locking mechanism 7, and the locking mechanism 7 can lower the height of the desk to facilitate moving the desk.

[0039] like Figure 4As shown, the moving mechanism 6 includes an electric push rod 61, a moving block 62, a first slide bar 63, a connecting block 64 and a wheel 65. The electric push rod 61 is installed on the middle part of the connecting rod 2 by means of bolts, and the moving block 62 is welded to the telescopic end of the electric push rod 61. The support legs 1 are slidably connected to the moving block 62. The first slide bars 63 are fixedly provided on both the front and rear sides of the lower part of the support legs 1. The connecting blocks 64 are symmetrically provided on both the left and right sides of the moving block 62. The adjacent first slide bars 63 are slidably connected to the connecting blocks 64. The wheels 65 are provided on both the left and right sides of the lower part of the connecting block 64 by means of bearings, and the support legs 1 are located between the wheels 65 on the same side.

[0040] like Figure 5 and Figure 6 As shown, the locking mechanism 7 includes a second sliding bar 71, a wedge block 72, a touch block 73, a third sliding bar 74, a block 75 and a first spring 76. The second sliding bars 71 are fixedly connected to the left and right sides of the moving block 62. The second sliding bars 71 are slidably connected to the connecting rod 2. A wedge block 72 is welded to the top of the second sliding bar 71. A third sliding bar 74 is provided on the inner side of the upper part of the supporting leg 1. A block 75 is slidably provided between the supporting leg 1 and the third sliding bar 74 on the same side. The block 75 is engaged with the first sliding bar 3 on the same side. A touch block 73 is provided at the lower part of the block 75. The touch block 73 is in contact with the wedge block 72 on the same side. The downward movement of the wedge block 72 can squeeze the touch block 73 to slide inwardly. The third sliding bar 74 is wound with a first spring 76. The inner end of the first spring 76 is connected to the third sliding bar 74, and the outer end of the first spring 76 is connected to the block 75.

[0041] In order to facilitate the use of the desks during class activities, the classroom can be equipped with such movable desks. When the desk needs to be moved, the student loosens the screw 5 and controls the telescopic end of the electric push rod 61 to extend, thereby driving the moving block 62 to slide downward, and the moving block 62 drives the wheel 65 to move downward and contact the ground through the connecting block 64. In this way, the support leg 1 is separated from the ground. With the rolling cooperation of the wheel 65, the desk can be easily moved on the ground. The moving block 62 slides downward to drive the second slide bar 71 to slide downward, thereby driving the wedge block 72 to move downward, and the wedge block 72 squeezes the touch block 7 When the locking cam 75 is in the locked state, the locking cam 75 is in the locked state, and the locking cam 75 is locked in the locked state. When students carry desks up and down stairs, they can easily carry desks even on uneven ground. When the desks need to be fixed on the ground, students control the telescopic end of the electric push rod 61 to shorten, thereby driving the moving block 62 to slide upward, and the moving block 62 drives the wheel 65 to move upward and separate from the ground through the connecting block 64. In this way, the support leg 1 contacts the ground, and the moving block 62 slides upward to drive the second slide bar 71 to slide upward, thereby driving the wedge block 72 to move upward, the wedge block 72 squeezes the touch block 73 to slide inward, and the touch block 73 drives the card block 75 to slide inward, and the first spring 76 is compressed, so that the card block 75 no longer gets stuck in the card slot on the upper part of the first sliding rod 3. At this time, the student lifts up the frame 4 again, and the frame 4 drives the first sliding rod 3 to move upward. When the wedge block 72 moves up to no longer contact the touch block 73, and the card block 75 corresponds to the card slot at the lower part of the first sliding rod 3, the first spring 76 is reset and drives the card block 75 to slide outward and get into the card slot at the lower part of the first sliding rod 3. The card block 75 slides outward and drives the touch block 73 to move outward and reset. In this way, the height of the desk is extended. At this time, the student tightens the screw 5 to facilitate the use of this desk during class activities.

[0042] Example 2

[0043] On the basis of Example 1, Figure 3 , Figure 7 and Figure 8As shown, it also includes a pulling mechanism 8, which is convenient for pushing the desk to move. The pulling mechanism 8 includes a support block 81, a first winding wheel 82, a first pull rope 83, a slide rail 84, a first rack 85, a first gear 86, a handle 87 and a second spring 88. A support block 81 is provided on the right rear side of the connecting rod 2, and the first winding wheel 82 is rotatably installed on the lower right rear side of the frame 4. The slide rail 84 is fixedly connected to the middle of the lower rear part of the connecting rod 2 by bolts. The first rack 85 is slidably provided on the slide rail 84, and a first pull rope 83 is provided on the support block 81. The first pull rope 83 successively passes around the first winding wheel 82 and passes through the slide rail 84 and is connected to the right end of the first rack 85. A handle 87 is rotatably provided on the middle part of the rear side of the frame 4 through a rotating shaft. The rotating shaft on the handle 87 is provided with a first gear 86 by a key connection. The first gear 86 is meshed with the first rack 85, and a second spring 88 is connected between the left end of the first rack 85 and the slide rail 84.

[0044] Initially, the second spring 88 is stretched. When the telescopic end of the control electric push rod 61 is extended, the wheel 65 moves downward and contacts the ground and the frame 4 is lowered. In this way, when the desk needs to be pushed on flat ground, the student needs to bend over to push it, which is inconvenient to operate. Therefore, when the frame 4 descends, the first pull rope 83 is relaxed, so that the second spring 88 is reset and drives the first rack 85 to slide to the left. The first rack 85 drives the handle 87 to swing upward to a vertical state through the first gear 86. The student can move the desk on flat ground by pushing the handle 87 without bending over. When the frame 4 rises, the first pull rope 83 pulls the first rack 85 to slide to the right, the second spring 88 is stretched, and the first rack 85 drives the handle 87 to swing downward and retract through the first gear 86. The first winding wheel 82 guides the first pull rope 83.

[0045] like Figure 1 , Fig. 9 , Fig.10 and Fig.11As shown, it also includes a blocking mechanism 9, which prevents books from falling out during movement. The blocking mechanism 9 includes a second winding wheel 91, a second pull rope 92, a first bracket 93, a third winding wheel 94, a second bracket 95, a baffle 96, a second gear 97, a sliding sleeve 98, a second rack 99 and a third spring 910. The second winding wheel 91 is connected to the key on the rotating shaft of the handle 87. Two second pull ropes 92 are connected to the second winding wheel 91. The first bracket 93 is provided at the rear of the left and right sides of the frame 4. The third winding wheel 94 is rotatably provided at the rear side of the first bracket 93. The frame The front parts of the left and right sides are both provided with a second bracket 95 and a sliding sleeve 98. The sliding sleeve 98 is located at the rear side of the second bracket 95. The middle part of the second bracket 95 is provided with a baffle 96 by means of a bearing. The baffle 96 is used to block the book. The front lower part of the baffle 96 is provided with a second gear 97. The outer side of the sliding sleeve 98 is provided with a second rack 99 in a sliding manner. The second pull rope 92 is passed around the third winding wheel 94 on the same side and connected to the rear end of the second rack 99 on the same side. The second gear 97 and the second rack 99 on the same side are meshed with each other. A third spring 910 is connected between the sliding sleeve 98 on the same side and the rear side of the second rack 99.

[0046] When the handle 87 swings upward, the handle 87 unwinds the second pull rope 92 through the second winding wheel 91, the second pull rope 92 relaxes, and the third spring 910 in the stretched state resets to drive the second rack 99 to slide forward, and the second rack 99 drives the baffle 96 to swing forward through the second gear 97. The two baffles 96 block the front side of the frame 4 to prevent the books in the frame 4 from tilting forward during the moving of the desk. When the handle 87 swings downward, the handle 87 tightens the second pull rope 92 through the second winding wheel 91, the second pull rope 92 pulls the second rack 99 to slide backward, the third spring 910 is stretched, and the second rack 99 drives the baffle 96 to swing backward and retract through the second gear 97, and the third winding wheel 94 guides the second pull rope 92.

[0047] like Figure 1 , Fig.12 and Fig.13 As shown, it also includes a pushing mechanism 10, which facilitates lifting the desk. The pushing mechanism 10 includes a hollow sleeve 101, a second sliding rod 102 and a fourth spring 103. Hollow sleeves 101 are provided on both sides of the top of the moving block 62. The hollow sleeves 101 slide through the connecting rod 2. The second sliding rod 102 is slidably provided on the upper part of the hollow sleeves 101. When the frame 4 is lowered, the second sliding rod 102 moves upward and can contact the bottom of the frame 4. The hollow sleeve 101 can cover the second sliding rod 102. The fourth spring 103 is connected between the bottom of the second sliding rod 102 on the same side and the inside of the hollow sleeve 101.

[0048] The moving block 62 slides up and down, driving the hollow sleeve 101 to move up and down, and the second sliding rod 102 and the fourth spring 103 move accordingly. When the second sliding rod 102 moves upward and contacts the bottom of the frame 4, and the blocking block 75 no longer blocks the slot on the upper part of the first sliding rod 3, the second sliding rod 102 rises a little distance by pushing the frame 4 upward, so that the slot on the upper part of the first sliding rod 3 does not correspond to the blocking block 75. Students can lift the frame 4 more conveniently to prevent the blocking block 75 from being re-stuck in the slot on the upper part of the first sliding rod 3. In the process of the second sliding rod 102 pushing the frame 4 upward, the fourth spring 103 is compressed. When the second sliding rod 102 is no longer in contact with the frame 4, the fourth spring 103 is reset.

[0049] like Figure 1 , Fig.14 and Fig.15 As shown, it also includes a flipping mechanism 11, which is convenient for moving the desk. The flipping mechanism 11 includes a third bracket 111, a handle 112, a torsion spring 113 and a stopper 114. The third bracket 111 is provided in the middle of the upper part of the first sliding rod 3, and the third bracket 111 is provided with a handle 112 through a bearing. Torsion springs 113 are wound around the front and rear sides of the handle 112, the inner ends of the torsion springs 113 are connected to the third bracket 111, and the outer ends of the torsion springs 113 are connected to the handle 112. Stoppers 114 are provided on the front and rear sides of the upper part of the first sliding rod 3, and the upper part of the handle 112 flips inward and downward to contact the stopper 114.

[0050] When the desk needs to be moved, the two handles 112 are respectively held with both hands and rotated upwards, the torsion spring 113 is twisted and deformed, and the upper part of the handle 112 is turned inward and downward and is limited when it contacts the stopper 114, so that it is convenient for students to move the desk. After putting down the desk, the handle 112 is released, and the torsion spring 113 is reset to drive the handle 112 to rotate downward and retract.

[0051] Although the present disclosure has been described with respect to only a limited number of embodiments, those skilled in the art having benefit of this disclosure will appreciate that various other embodiments can be devised without departing from the scope of the present invention. Accordingly, the scope of the present invention should be limited only by the appended claims.

Claims

1. A movable desk for facilitating class collective activities, comprising a support leg (1), a connecting rod (2), a first sliding rod (3), a frame (4) and a screw (5), wherein the support leg (1) is two in number, a connecting rod (2) is connected between the two support legs (1), the upper part of each support leg (1) is provided with a first sliding rod (3) in a sliding manner, the top of each first sliding rod (3) is connected with a frame (4), the upper part of each support leg (1) is provided with a screw (5) having a tightening function in a threaded manner, the inner end of each screw (5) is in contact with the first sliding rod (3) on the same side, and the characteristics are: It also includes a moving mechanism (6) and a locking mechanism (7), wherein the moving mechanism (6) is connected between the connecting rod (2) and the supporting foot (1) to facilitate the movement of the desk on a plane, and the moving mechanism (6) is provided with a locking mechanism (7) capable of lowering the height of the desk to facilitate the movement of the desk; The electric push rod (61), the moving block (62), the first slide rod (63), the connecting block (64) and the wheel (65) constitute a moving mechanism (6), wherein the electric push rod (61) is installed in the middle of the connecting rod (2), the telescopic end of the electric push rod (61) is provided with a moving block (62) slidably connected to the support leg (1), the front and rear sides of the lower part of the support leg (1) are both provided with first slide rods (63), the left and right sides of the moving block (62) are both symmetrically provided with connecting blocks (64), the adjacent first slide rods (63) are slidably connected to the connecting blocks (64), the left and right sides of the lower part of the connecting block (64) are both rotatably provided with wheels (65), and the support leg (1) is located between the wheels (65) on the same side; The second slide bar (71), the wedge block (72), the touch block (73), the third slide bar (74), the block (75) and the first spring (76) constitute a locking mechanism (7), the left and right sides of the moving block (62) are provided with second slide bars (71) slidably connected to the connecting rod (2), the top of the second slide bar (71) is provided with a wedge block (72), the inner side of the upper part of the support foot (1) is provided with a third slide bar (74), the support foot (1) and the third slide bar (74) on the same side are slidably provided with a block (75) engaged with the first slide bar (3) on the same side, the lower part of the block (75) is provided with a touch block (73) contacting and cooperating with the wedge block (72) on the same side, the third slide bar (74) is wound with a first spring (76), the inner end of the first spring (76) is connected to the third slide bar (74), and the outer end of the first spring (76) is connected to the block (75); The invention is characterized in that it also includes a pulling mechanism (8) for conveniently pushing the desk to move, wherein a support block (81), a first winding wheel (82), a first pull rope (83), a slide rail (84), a first rack (85), a first gear (86), a handle (87) and a second spring (88) constitute the pulling mechanism (8), a support block (81) is provided at the right rear side of the connecting rod (2), a first winding wheel (82) is rotatably provided at the lower right rear side of the frame (4), and a support block (81) is provided at the lower rear side of the connecting rod (2). A slide rail (84) is provided in the middle, a first rack (85) is slidably provided on the slide rail (84), a first pull rope (83) is provided on the support block (81), the first pull rope (83) is connected to the right end of the first rack (85), a handle (87) is rotatably provided in the middle of the rear side of the frame (4), a first gear (86) meshing with the first rack (85) is provided on the handle (87), and a second spring (88) is connected between the left end of the first rack (85) and the slide rail (84).

2. A movable desk for class collective activities according to claim 1, characterized in that: The bookcase (87) further comprises a material blocking mechanism (9) for preventing the book from falling out during the moving process. The material blocking mechanism (9) is composed of a second winding wheel (91), a second pull rope (92), a first bracket (93), a third winding wheel (94), a second bracket (95), a baffle (96), a second gear (97), a sliding sleeve (98), a second rack (99) and a third spring (910). The handle (87) is provided with a second winding wheel (91), and two second pull ropes (92) are connected to the second winding wheel (91). The left and right rear parts of the frame (4) are both provided with first brackets (93), and the rear part of the first bracket (93) is both provided with a third winding wheel (94) in a rotatable manner. The frame (87) (4) A second bracket (95) and a sliding sleeve (98) located at the rear side of the second bracket (95) are provided at the front of both left and right sides, a baffle (96) for blocking the book is rotatably provided at the middle of the second bracket (95), a second gear (97) is provided at the front lower part of the baffle (96), a second rack (99) is slidably provided at the outer side of the sliding sleeve (98), the second pull rope (92) is passed around the third winding wheel (94) on the same side and connected to the rear end of the second rack (99) on the same side, the second gear (97) and the second rack (99) on the same side are meshed with each other, and a third spring (910) is connected between the sliding sleeve (98) and the rear side of the second rack (99) on the same side.

3. A movable desk for class collective activities according to claim 2, characterized in that: The device also includes a pushing mechanism (10) for facilitating lifting of the desk, wherein the pushing mechanism (10) includes a hollow sleeve (101), a second sliding rod (102) and a fourth spring (103). The left and right sides of the top of the moving block (62) are both provided with hollow sleeves (101), the upper part of the hollow sleeve (101) is slidably provided with a second sliding rod (102) for pushing the frame (4) upward, and the fourth spring (103) is connected between the bottom of the second sliding rod (102) on the same side and the inside of the hollow sleeve (101).

4. A movable desk for class activities according to claim 3, characterized in that: The desk also includes a flip mechanism (11) for conveniently moving the desk. The flip mechanism (11) includes a third bracket (111), a handle (112), a torsion spring (113) and a stopper (114). The third bracket (111) is provided in the middle of the upper part of the first sliding rod (3). The handle (112) is rotatably provided on the third bracket (111). The torsion spring (113) is wound around the front and rear sides of the handle (112). The inner end of the torsion spring (113) is connected to the third bracket (111), and the outer end of the torsion spring (113) is connected to the handle (112). Stoppers (114) for limiting the handle (112) are provided on the front and rear sides of the upper part of the first sliding rod (3).

5. A movable desk for class activities according to claim 1, characterized in that: The first sliding rod (3) has two upper and lower slots formed on its inner side.

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