Multi-scroll ultra-large blackboard and use method thereof

Abstract

The present invention discloses a multi-scroll, ultra-large-area blackboard and a method for using the same. The blackboard includes a screen, with a first and a second scroll assembly connected to each end for retracting and unreeling the screen. A transfer assembly is provided between the first and second scroll assemblies to allow the front and back sides of the screen to be presented on the same side. The front and back sides of the screen are used for projection and writing, respectively. The screen extends from the first scroll assembly, passes around the outer walls of the second assembly and the transfer assembly, and finally extends into the interior of the second assembly. The present invention greatly increases the length of the writing area, effectively avoiding the adverse effects of constantly wiping the blackboard during class.

Description

Technical Field

[0001] The present invention relates to the technical field of blackboards, in particular to a multi-scroll ultra-large-area blackboard and a method for using the same. Background Art

[0002] A blackboard isn't just a black surface. Traditionally, it's a hard, flat surface that can be repeatedly written on with chalk, often used for teaching. Blackboards are typically made of wood or frosted glass, and can be written on with chalk and other specific writing materials. However, existing blackboards are limited in area, requiring teachers to constantly wipe them. During class, blackboards are often used in conjunction with projection screens, but this further reduces the usable area. Therefore, a new multi-axis, ultra-large blackboard is urgently needed. Summary of the Invention

[0003] The purpose of the present invention is to provide a multi-scroll ultra-large area blackboard, which greatly increases the length of the writing area, effectively avoids the adverse effects of constantly wiping the blackboard during class, and solves the problems in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multi-roller ultra-large blackboard, comprising a screen, wherein a first and a second roll assembly for retracting and unreeling the screen are connected to both ends of the screen, respectively; a transfer assembly is provided between the first and second roll assemblies for allowing the front and back sides of the screen to be presented on the same side; the front and back sides of the screen are used for projection and writing, respectively;

[0005] The curtain passes through the first reel assembly, and successively passes around the outer walls of the second assembly and the transmission assembly, and finally extends into the interior of the second assembly. Telescopic mechanisms for adjusting the distance are respectively provided between the first reel assembly and the second reel assembly, and between the second reel assembly and the transmission assembly.

[0006] Preferably, the first reel assembly includes a fixed sleeve and first mounting parts fixed at both ends thereof, and reel rollers for reeling and unreeling the curtain are rotatably mounted on opposite surfaces of the two first mounting parts. The reel rollers are arranged inside the fixed sleeve, and a through slot for the curtain to pass through is provided on the fixed sleeve. A handle for driving the reel roller to rotate back and forth is installed on the first mounting part, and the structure of the second reel assembly is the same as that of the first reel assembly.

[0007] Preferably, the transfer assembly includes two second mounting members, and a transfer roller is rotatably mounted between the two second mounting members.

[0008] Preferably, the telescopic mechanism includes a fixing member fixed on the side wall of the first mounting member, an expandable articulated frame is connected to the fixing member, and the articulated frame is hinged to two connecting rods at one end away from the fixing member, and mutually meshing incomplete gears are installed at the opposite ends of the two connecting rods, and the two incomplete gears are rotatably installed inside the first mounting frame, and the first mounting frame is fixed to the side wall of the first mounting member or the second mounting member corresponding to the telescopic mechanism, and the first mounting member is also provided with a push-pull mechanism for driving the movement of the articulated frame.

[0009] Preferably, the push-pull mechanism includes a first mounting bar fixed on the side wall of the first mounting member, a movable bar is slidably installed on the first mounting bar, and the movable bar and the first mounting bar are locked in position through the limiting cooperation of the limiting groove and the first limiting bolt. The end of the movable bar away from the first mounting bar is fixedly connected to a push-pull rod, and the push-pull rod is fixedly connected to the first hinge axis where the hinge frame is located.

[0010] Preferably, a support mechanism is connected between the telescopic mechanism where the first scroll assembly and the second scroll assembly are located to prevent the curtain from sinking when writing. The support mechanism includes a plurality of support bars, each of which is arranged between two hinged frames, and the support bars are slidably connected to the hinges near the inner sides of the hinged frames.

[0011] Preferably, a limiting mechanism for ensuring the horizontality of the writing area is installed on the first mounting member on the back of the curtain, and the limiting mechanism includes two rotatable limiting rollers, and the two limiting rollers are respectively fixed to the corresponding first mounting member through a first supporting block.

[0012] Preferably, the transmission component is provided with a protective frame for protecting the projection area outside the screen, and a first cleaning roller for wiping dust from the projection area is provided on one side of the protective frame. The first cleaning roller is rotatably mounted on the second mounting member through a second supporting block.

[0013] Preferably, two second mounting strips are fixedly mounted on the first scroll assembly on the front side of the curtain, movable blocks are slidably mounted on the two second mounting strips, a second cleaning roller for wiping the writing area is rotatably mounted between the two movable blocks, and the movable block is fixed to the second mounting strip by the limiting cooperation of the second limiting bolt and the limiting hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention greatly increases the length of the writing area through the structural setting, effectively avoiding the adverse effects caused by the need to constantly wipe the blackboard during class.

[0016] 2. In the present invention, the first scroll assembly, the second scroll assembly and the transmission assembly are linearly distributed in sequence and have the same diameter. The curtain passes through the first scroll assembly, passes around the outer walls of the second assembly and the transmission assembly in sequence, and finally extends into the interior of the second assembly. As a result, the inner area of the curtain and the outer wall area of the curtain are located on the same side, which facilitates simultaneous writing and projection teaching during the educational process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a left-side perspective structural diagram of the present invention;

[0018] Figure 2 It is a right-side perspective structural diagram of the present invention;

[0019] Figure 3 This is a structural schematic diagram of the present invention in an upright working state;

[0020] Figure 4 This is a structural diagram of the present invention in the suspension working state;

[0021] Figure 5 It is a front view structural schematic diagram of the present invention;

[0022] Figure 6 It is a rear view structural schematic diagram of the present invention;

[0023] Figure 7 It is a schematic diagram of the cross-sectional structure at AA of the present invention.

[0024] In the figure: 1. Mounting support; 2. Fixing sleeve; 3. Curtain; 4. Limiting roller; 5. First mounting part; 6. Support bar; 7. First receiving block; 8. Fixing part; 9. Push-pull rod; 10. Articulated frame; 11. Connecting rod; 12. First mounting frame; 13. Protective frame; 14. First mounting hole; 15. Second mounting frame; 16. First cleaning roller; 17. Second receiving block; 18. Second mounting part; 19. Transfer roller; 20. Movable bar; 21. First limiting bolt; 22. First mounting bar; 23. Incomplete gear; 24. Limiting slot; 25. Handle; 26. Retracting roller; 27. Second cleaning roller; 28. Through slot; 29. Second mounting bar; 30. Second limiting bolt; 31. Limiting hole; 32. Movable block; 33. Second mounting hole. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figures 1 to 7 The present invention provides a technical solution: a multi-roller ultra-large blackboard, comprising a screen 3, wherein both ends of the screen 3 are connected to a first roll assembly and a second roll assembly for reeling and unreeling the screen 3, respectively; a transmission assembly is provided between the first roll assembly and the second roll assembly for allowing the front and back sides of the screen to be presented on the same side; the front and back sides of the screen 3 are used for projection and writing, respectively;

[0027] The curtain 3 passes through the first reel assembly, and successively passes around the outer walls of the second assembly and the transmission assembly, and finally extends to the interior of the second assembly. Telescopic mechanisms for adjusting the distance are respectively provided between the first reel assembly and the second reel assembly, and between the second reel assembly and the transmission assembly.

[0028] like Figure 3 As shown, the screen 3 passes through the first reel assembly, and successively passes around the outer wall of the second assembly and the transmission assembly, and finally extends to the inside of the second assembly, so that the inner area of the screen 3 and the outer wall area of the screen 3 are on the same side. The side for projection can be a fiberglass screen, and the other side for writing can be a black screen, that is, the shaded area on 3 in the figure is the writing area, and the blank area on the screen 3 is the projection area, so that it is convenient for writing and projection teaching to be carried out at the same time during the education process. When the handle 25 on the first reel assembly or the second reel assembly is manually shaken, the writing area can be adjusted. The amount of the screen wrapped around the first reel assembly or the second reel assembly is the adjustment distance of the writing area, and the area after writing is completed is rolled up. At the same time, the adjustment process does not affect the use of projection. This design greatly increases the length of the writing area and effectively avoids the adverse effects caused by the need to constantly wipe the blackboard during class.

[0029] Specifically, the first reel assembly includes a fixed sleeve 2 and first mounting members 5 fixed at both ends thereof. Reeling rollers 26 for reeling and unreeling the curtain 3 are rotatably mounted on opposite surfaces of the two first mounting members 5. The reeling rollers 26 are arranged inside the fixed sleeve 2. A through slot 28 is provided on the fixed sleeve 2 for the curtain 3 to pass through. A roller for transporting the curtain 3 may be provided on the inner wall of the through slot 28. A handle 25 for driving the reeling roller 26 to rotate back and forth is installed on the first mounting member 5. The structure of the second reel assembly is the same as that of the first reel assembly.

[0030] By setting up the first reel assembly, due to the presence of the fixed sleeve 2, the reeling roller 26 is located inside the fixed sleeve 2 to perform the reeling work, which effectively avoids the diameter changes caused by the reeling and unreeling of the first reel assembly and the second reel assembly, and ensures that the diameters of the second reel assembly and the transmission assembly are always the same, thereby ensuring the level of the projection area.

[0031] Specifically, the transfer assembly includes two second mounting members 18, between which a transfer roller 19 is rotatably mounted. The transfer roller 19 acts as a reversing action, so that the inner area of the curtain 3 and the outer wall area of the curtain 3 are located on the same side.

[0032] Specifically, the telescopic mechanism includes a fixing member 8 fixed on the side wall of the first mounting member 5, and an expandable articulated frame 10 is connected to the fixing member 8. The articulated frame 10 is hinged to two connecting rods 11 at one end away from the fixing member 8. The opposite ends of the two connecting rods 11 are installed with incomplete gears 23 that mesh with each other. The two incomplete gears 23 are rotatably installed inside the first mounting frame 12. The first mounting frame 12 is fixed to the side wall of the first mounting member 5 or the second mounting member 18 corresponding to the telescopic mechanism. A push-pull mechanism for driving the articulated frame 10 to move is also provided on the first mounting member 5.

[0033] Since one end of the articulated frame 10 is fixedly mounted on the first mounting member 5 via the fixing member 8, and the other end is connected to the incomplete gears 23 that mesh with each other, when the distance between the fixing point and the hinge point of the articulated frame 10 increases, the length of the articulated frame 10 increases. Similarly, when the distance between the fixing point and the hinge point of the articulated frame 10 decreases, the length of the articulated frame 10 decreases. By adjusting the distance between the first scroll assembly and the second scroll assembly, and between the second scroll assembly and the transmission assembly, the size of the required writing area and projection area can be adjusted accordingly.

[0034] Specifically, the push-pull mechanism includes a first mounting bar 22 fixed on the side wall of the first mounting member 5, and a movable bar 20 is slidably installed on the first mounting bar 22. The movable bar 20 and the first mounting bar 22 are locked in position through the limiting cooperation of the limiting groove 24 and the first limiting bolt 21. The end of the movable bar 20 away from the first mounting bar 22 is fixedly connected to a push-pull rod 9, and the push-pull rod 9 is fixedly connected to the first hinge axis where the hinge frame 10 is located.

[0035] The movable bar 20 is slidably installed on the first mounting bar 22. When the movable bar 20 is manually pushed to slide back and forth on the first mounting bar 22, the distance between the fixed point and the hinge point of the articulated frame 10 can be increased or decreased, and the movable bar 20 can be fixed on the first mounting bar 22 by the limiting cooperation of the first limiting bolt 21 and the limiting groove 24.

[0036] Specifically, a support mechanism is connected between the telescopic mechanism where the first scroll assembly and the second scroll assembly are located to prevent the curtain 3 from sinking when writing. The support mechanism includes a plurality of support bars 6, each support bar 6 is arranged between two hinged frames 10, and the support bars 6 are slidably connected to the hinge near the inner side of the hinged frame 10.

[0037] By setting up multiple support bars 6, when adjusting the distance between the first scroll assembly and the second scroll assembly, on the one hand, the area of the writing area can be adjusted. On the other hand, by changing the length of the hinged frame 10, the support bars 6 are evenly distributed on the back side of the corresponding writing area. The supporting effect of the support bars 6 can effectively avoid the adverse effects of the curtain 3 due to insufficient hardness.

[0038] Specifically, a limiting mechanism for ensuring the levelness of the writing area is installed on the first mounting member 5 on the back of the curtain 3. The limiting mechanism includes two rotatable limiting rollers 4. The two limiting rollers 4 are respectively fixed to the corresponding first mounting member 5 through the first receiving block 7.

[0039] The two limiting rollers 4 can further ensure the levelness of the writing area. At the same time, the conveying effect of the limiting rollers 4 can effectively improve the flatness of the curtain 3.

[0040] Specifically, the transmission assembly is provided with a protective frame 13 for protecting the external projection area of the screen 3. A first cleaning roller 16 for wiping dust from the projection area is provided on one side of the protective frame 13. The first cleaning roller 16 is rotatably mounted on the second mounting member 18 through the second receiving block 17.

[0041] By providing the first cleaning roller 16, when the written area is rolled up or the distance of the writing area is adjusted, the screen 3 moves and continuously rubs against the first cleaning roller 16, thereby cleaning the projection area where the outer wall is located.

[0042] Specifically, two second mounting bars 29 are fixedly mounted on the first scroll assembly on the front side of the curtain 3, and movable blocks 32 are slidably mounted on the two second mounting bars 29. A second cleaning roller 27 for wiping the writing area is rotatably mounted between the two movable blocks 32, and the movable block 32 is fixed to the second mounting bar 29 by the limiting cooperation of the second limiting bolt 30 and the limiting hole 31.

[0043] When it is necessary to wipe the writing area, the movable block 32 is slid on the second mounting bar 29, so that the second cleaning roller 27 contacts the writing area where the screen 3 is located. At this time, the first mounting member 5 on the first reel assembly is manually rotated to reel the screen 3, further making the writing area on the screen 3 contact the second cleaning roller 27. The writing on the screen 3 can be cleaned by the friction between the second cleaning roller 27 and the screen 3. When wiping is no longer needed, the movable block 32 can be moved to the end away from the screen 3.

[0044] Specifically, in order to make the blackboard be hung or used upright, two sets of mounting brackets 1 are connected to the opposite sides of the first scroll assembly and the transmission assembly, such as Figure 3As shown, the blackboard is in an upright working state, and the second mounting frame 15 where the mounting support 1 is located can be fixed to the ground through the second mounting hole 33 at the bottom thereof, as shown in FIG. Figure 4 As shown, the blackboard is in the working state of being hung, and can be fixed to the corresponding wall through the first mounting hole 14 opened on the side wall of the second mounting frame 15.

[0045] A method for using a multi-scroll ultra-large blackboard, comprising:

[0046] S1: If Figure 3 As shown, the screen passes through the first reel assembly, and successively passes around the outer wall of the second assembly and the transfer assembly, and finally extends into the interior of the second assembly, so that the inner area of the screen and the outer wall area of the screen are located on the same side. The side for projection can be a fiberglass screen, and the other side for writing can be a black screen, so that writing and projection teaching can be carried out simultaneously during the educational process. When the handle on the first reel assembly or the second reel assembly is manually shaken, the writing area can be adjusted. The amount of screen wrapped around the first reel assembly or the second reel assembly is the adjusted distance of the writing area. The area after writing is completed is rolled up, and the adjustment process does not affect the use of projection.

[0047] S2: When the movable bar is manually pushed to slide on the first mounting bar toward one end of the second mounting frame, the distance between the fixed point of the articulated frame and the hinge point increases, and the length of the articulated frame increases. Similarly, when the movable bar moves in the opposite direction, the length of the articulated frame decreases. The first limiting bolt cooperates with the limiting groove to fix the movable bar on the first mounting bar, thereby adjusting the size of the desired writing area and projection area accordingly.

[0048] S3: When adjusting the distance between the first scroll assembly and the second scroll assembly, on the one hand, the area of the writing area can be adjusted, and on the other hand, by changing the length of the hinged frame, the support strips are evenly distributed on the back of the corresponding writing area. The supporting effect of the support strips can effectively avoid the adverse effects of the screen due to insufficient hardness.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-scroll large-area blackboard, comprising a curtain (3), characterized in that: The two ends of the screen (3) are respectively connected to a first reel assembly and a second reel assembly for reeling and unreeling the screen (3); a transmission assembly is provided between the first reel assembly and the second reel assembly so that the front and back sides of the screen are presented on the same side; the front and back sides of the screen (3) are respectively used for projection and writing; The curtain (3) passes through the first reel assembly, and sequentially passes around the outer wall of the second reel assembly and the transmission assembly, and finally extends to the interior of the second reel assembly. A telescopic mechanism for adjusting the distance is respectively provided between the first reel assembly and the second reel assembly, and between the second reel assembly and the transmission assembly. The first reel assembly comprises a fixed sleeve (2) and first mounting members (5) fixed at both ends thereof, and reeling rollers (26) for reeling and unreeling the curtain (3) are rotatably mounted on opposite surfaces of the two first mounting members (5), the reeling rollers (26) being arranged inside the fixed sleeve (2), and the fixed sleeve (2) is provided with a through slot (28) for the curtain (3) to pass through, and a handle (25) for driving the reeling rollers (26) to rotate back and forth is mounted on the first mounting member (5), and the structure of the second reel assembly is the same as that of the first reel assembly; The transfer assembly comprises two second mounting members (18), and a transfer roller (19) is rotatably mounted between the two second mounting members (18).

2. The multi-scroll ultra-large blackboard according to claim 1, characterized in that: The telescopic mechanism comprises a fixing member (8) fixed on the side wall of the first mounting member (5), an expandable articulated frame (10) is connected to the fixing member (8), and the articulated frame (10) is hinged to two connecting rods (11) at one end away from the fixing member (8), and mutually meshing incomplete gears (23) are installed at opposite ends of the two connecting rods (11), and the two incomplete gears (23) are rotatably installed inside the first mounting frame (12), and the first mounting frame (12) is fixed to the side wall of the first mounting member (5) or the second mounting member (18) corresponding to the telescopic mechanism, and the first mounting member (5) is also provided with a push-pull mechanism for driving the articulated frame (10) to move.

3. The multi-scroll ultra-large blackboard according to claim 2, characterized in that: The push-pull mechanism includes a first mounting bar (22) fixed on the side wall of the first mounting member (5), a movable bar (20) is slidably mounted on the first mounting bar (22), and the movable bar (20) and the first mounting bar (22) are locked in position by the limiting cooperation of the limiting groove (24) and the first limiting bolt (21), and the end of the movable bar (20) away from the first mounting bar (22) is fixedly connected to a push-pull rod (9), and the push-pull rod (9) is fixedly connected to the first hinge axis of the hinge frame (10).

4. The multi-scroll ultra-large blackboard according to claim 1, characterized in that: A support mechanism for preventing the screen (3) from being dented when writing is connected between the telescopic mechanism where the first scroll assembly and the second scroll assembly are located. The support mechanism comprises a plurality of support bars (6), each of the support bars (6) being arranged between two hinged frames (10), and the support bars (6) are slidably connected to the hinged frames (10) near the inner hinge.

5. The multi-scroll ultra-large blackboard according to claim 1, characterized in that: A limiting mechanism for ensuring the horizontality of the writing area is installed on the first mounting member (5) on the back of the curtain (3), and the limiting mechanism includes two rotatable limiting rollers (4). The two limiting rollers (4) are respectively fixed to the corresponding first mounting member (5) through the first receiving block (7).

6. The multi-scroll ultra-large blackboard according to claim 1, characterized in that: The transmission component is provided with a protective frame (13) for protecting the external projection area of the screen (3); a first cleaning roller (16) for wiping dust from the projection area is provided on one side of the protective frame (13); the first cleaning roller (16) is rotatably mounted on the second mounting member (18) via a second receiving block (17).

7. The multi-scroll ultra-large blackboard according to claim 1, characterized in that: Two second mounting strips (29) are fixedly mounted on the first scroll assembly on the front side of the curtain (3); movable blocks (32) are slidably mounted on the two second mounting strips (29); a second cleaning roller (27) for wiping the writing area is rotatably mounted between the two movable blocks (32); the movable block (32) is fixed to the second mounting strip (29) by means of a second limiting bolt (30) and a limiting hole (31) that engages with the limiting bolt.

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