Blackboard with extensible board surface

Abstract

The utility model relates to the technical field of blackboards, in particular to a blackboard with extensible board surfaces, which adopts the technical scheme that the blackboard comprises a blackboard body, two extensible boards and an adjusting box, accommodating cavities are formed in two side ends of the blackboard body, positioning grooves are formed in the inner walls of the upper ends of the accommodating cavities, and the two extensible boards are symmetrically arranged in the accommodating cavities. Mounting plates which are symmetrically distributed are mounted at the lower ends of the expansion plates, moving rollers which are uniformly and equidistantly distributed are rotatably mounted between the mounting plates, the moving rollers are in contact with the inner wall of the bottom end of the storage cavity, the adjusting box is mounted at the upper end of the blackboard body, and a threaded rod is rotatably mounted in the adjusting box; moving blocks which are symmetrically distributed are installed on the threaded rod in a threaded mode, fixing rods are installed at the upper ends of the moving blocks, and the tail ends of the fixing rods are connected with the side ends of the expansion plates. The multifunctional blackboard has the advantages that the blackboard has a storage function, the board surface of the blackboard can be automatically expanded during use, the writing range of the blackboard is increased, and the blackboard is convenient to use for teaching.

Description

Technical Field

[0001] The utility model relates to the technical field of blackboards, in particular to a blackboard with an expandable board surface. Background Art

[0002] A blackboard is a flat surface that is repeatedly written on with chalk. It is hard and is mostly used for teaching. Blackboards are mainly made of wood. During teaching, teachers use chalk to write on the blackboard, and students learn by looking at what is written on the blackboard.

[0003] Currently, the surface of the blackboard is of a fixed size. When the writing area on the blackboard is insufficient, the teacher needs to erase the previously written content. If the students do not record it in time, it will affect the students' learning. If the area of ​​the blackboard is increased, it will be inconvenient for the processing and transportation of the blackboard. Utility Model Content

[0004] The purpose of the utility model is to provide a blackboard with an expandable board surface, which has a storage function and can automatically expand the board surface of the blackboard during use, thereby increasing the writing range of the blackboard and facilitating the use of the blackboard for teaching, thereby solving the problems raised by the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a blackboard with an expandable board surface, comprising a blackboard body, an expansion board and an adjustment box, storage cavities are provided on both side ends of the blackboard body, a positioning groove is provided on the upper inner wall of the storage cavity, two expansion boards are symmetrically arranged in the storage cavity, symmetrically distributed mounting plates are installed at the lower ends of the expansion boards, and evenly and equidistantly distributed moving rollers are rotatably installed between the mounting plates, and the moving rollers contact the bottom inner wall of the storage cavity, the adjustment box is installed at the upper end of the blackboard body, a threaded rod is rotatably installed in the adjustment box, symmetrically distributed moving blocks are threadedly installed on the threaded rod, a fixing rod is installed at the upper end of the moving block, and the end of the fixing rod is connected to the side end of the expansion board.

[0006] When using the blackboard with an expandable board surface of the utility model,

[0007] When the surface of the blackboard body is not large enough for writing, the driving device can make the threaded rod rotate clockwise, and the clockwise rotation of the threaded rod can make the two movable blocks move away from each other, so that the expansion board can be pulled and slide out of the storage cavity. At this time, writing can continue on the expansion board. When the expansion board is not needed, the threaded rod is rotated counterclockwise to store the two expansion boards back into the storage cavity.

[0008] Preferably, a placement plate is installed at a lower position of the front end surface of the blackboard body, and a placement groove is opened at the upper end of the placement plate.

[0009] Preferably, a positioning block is provided at the upper end of the expansion board, the size of the positioning block matches the size of the positioning slot, and the positioning block is located in the positioning slot.

[0010] Preferably, the threaded rod is provided with a positive thread structure and a negative thread structure, and the positive thread structure and the negative thread structure are symmetrically distributed with respect to the threaded rod.

[0011] Preferably, a driving device is installed at the side end of the regulating box, and the main shaft of the driving device is connected to the axis of the threaded rod.

[0012] Preferably, a movable opening is provided at the upper end of the regulating box, and the fixing rod extends out of the regulating box from the movable opening.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: when the surface of the blackboard body is not enough for writing, the threaded rod can be rotated by the driving device, and the expansion board can be pulled with the cooperation of the two movable blocks to slide out of the storage cavity. The expansion board can increase the writing range of the blackboard, and can automatically expand the surface of the blackboard to increase the writing range of the blackboard, which is convenient for the use of the blackboard for teaching. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the utility model;

[0015] Figure 2 This is a front view structural schematic diagram of the utility model;

[0016] Figure 3 This is a schematic diagram of the blackboard body structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the expansion board structure of the utility model;

[0018] Figure 5 It is a partial cross-sectional structural schematic diagram of the utility model.

[0019] The reference numerals and names in the figures are as follows:

[0020] 101. Blackboard body; 102. Placement board; 103. Storage slot; 104. Storage cavity; 105. Positioning slot; 201. Extension board; 202. Positioning block; 203. Mounting plate; 204. Moving roller; 301. Adjustment box; 302. Moving block; 303. Fixed rod; 304. Driving device; 305. Threaded rod; 306. Movable opening. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example

[0023] See also Figures 1 to 5 The utility model provides an embodiment: a blackboard with an expandable board surface, comprising:

[0024] The blackboard body 101, the expansion board 201 and the adjustment box 301, the two sides of the blackboard body 101 are provided with a storage cavity 104, the upper inner wall of the storage cavity 104 is provided with a positioning groove 105, the two expansion boards 201 are symmetrically arranged in the storage cavity 104, the lower end of the expansion board 201 is equipped with a symmetrically distributed mounting plate 203, and the mounting plates 203 are rotatably installed with evenly and equidistantly distributed moving rollers 204, and the moving rollers 204 are rotatably installed with the storage cavity 104. The bottom inner wall of 104 is in contact with the expansion board 201, and the movable roller 204 is set to slide the expansion board 201, so as to facilitate the movement of the expansion board 201. The adjusting box 301 is installed at the upper end of the blackboard body 101, and a threaded rod 305 is rotatably installed in the adjusting box 301. The threaded rod 305 is threadedly installed with symmetrically distributed moving blocks 302, and a fixed rod 303 is installed at the upper end of the moving block 302. The end of the fixed rod 303 is connected to the side end of the expansion board 201.

[0025] In this embodiment, when the surface of the blackboard body 101 is not large enough for writing, the driving device 304 can be used to make the threaded rod 305 rotate clockwise. The clockwise rotation of the threaded rod 305 can move the two movable blocks 302 away from each other, so that the expansion board 201 can be pulled to slide out of the storage cavity 104. At this time, writing can continue on the expansion board 201. When the expansion board 201 is not needed, the threaded rod 305 is rotated counterclockwise to re-store the two expansion boards 201 into the storage cavity 104.

[0026] Furthermore,

[0027] A placing plate 102 is installed at the lower position of the front end surface of the blackboard body 101, and a placing groove 103 is opened at the upper end of the placing plate 102. The placing plate 102 and the placing groove 103 are used to place chalk and a blackboard eraser.

[0028] Furthermore,

[0029] A positioning block 202 is disposed at the upper end of the expansion board 201 . The size of the positioning block 202 matches the size of the positioning slot 105 , and the positioning block 202 is located in the positioning slot 105 .

[0030] Furthermore,

[0031] The threaded rod 305 is provided with a positive thread structure and a negative thread structure, and the positive thread structure and the negative thread structure are symmetrically distributed with respect to the threaded rod 305 .

[0032] Furthermore,

[0033] The side end of the regulating box 301 is provided with a driving device 304, and the main shaft of the driving device 304 is connected to the axis of the threaded rod 305. The driving device 304 can make the threaded rod 305 rotate clockwise or counterclockwise, and the clockwise or counterclockwise rotation of the threaded rod 305 can make the two movable blocks 302 move away from or close to each other.

[0034] Furthermore,

[0035] The upper end of the adjusting box 301 is provided with a movable opening 306, and the fixing rod 303 extends out of the adjusting box 301 from the movable opening 306. The setting of the movable opening 306 can facilitate the fixing rod 303 to move to a different position.

[0036] The driving device 304 in the present invention is a well-known device, and its working principle and circuit connection are well known to technicians in this field, and are conventional means or common knowledge, so they will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A blackboard with an expandable surface, comprising a blackboard body (101), an expansion board (201) and an adjustment box (301), characterized in that: The blackboard body (101) is provided with a storage cavity (104) at both side ends, and a positioning groove (105) is provided on the upper inner wall of the storage cavity (104). The two expansion plates (201) are symmetrically arranged in the storage cavity (104). The lower ends of the expansion plates (201) are provided with symmetrically distributed mounting plates (203). Moving rollers (204) evenly and equidistantly distributed are rotatably mounted between the mounting plates (203). The moving rollers (204) are in contact with the inner wall of the bottom end of the storage cavity (104). The adjustment box (301) is mounted at the upper end of the blackboard body (101). A threaded rod (305) is rotatably mounted in the adjustment box (301). The threaded rod (305) is threadedly provided with symmetrically distributed moving blocks (302). A fixing rod (303) is mounted at the upper end of the moving block (302). The end of the fixing rod (303) is connected to the side end of the expansion plate (201).

2. The blackboard with expandable board surface according to claim 1, characterized in that: A placement plate (102) is installed at the lower part of the front end surface of the blackboard body (101), and a placement groove (103) is provided at the upper end of the placement plate (102).

3. The blackboard with expandable board surface according to claim 1, characterized in that: A positioning block (202) is provided at the upper end of the expansion board (201); the size of the positioning block (202) matches the size of the positioning slot (105), and the positioning block (202) is located in the positioning slot (105).

4. The blackboard with expandable board surface according to claim 1, characterized in that: The threaded rod (305) is provided with a positive thread structure and a negative thread structure, and the positive thread structure and the negative thread structure are symmetrically distributed with respect to the threaded rod (305).

5. The blackboard with expandable board surface according to claim 1, characterized in that: A driving device (304) is installed at the side end of the regulating box (301), and the main shaft of the driving device (304) is connected to the axis of the threaded rod (305).

6. The blackboard with expandable board surface according to claim 1, characterized in that: The upper end of the regulating box (301) is provided with a movable opening (306), and the fixing rod (303) extends out of the regulating box (301) from the movable opening (306).

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