Adjustable blackboard convenient to use

Abstract

The invention discloses an adjustable blackboard convenient to use, and belongs to the technical field of teaching tools, the adjustable blackboard convenient to use comprises a fixing mechanism mounted on a wall surface through screws, a support is fixedly connected to the side wall, away from the wall surface, of the fixing mechanism, a hollow cavity is formed in the support, and two auxiliary boards are symmetrically arranged in the hollow cavity; a telescopic driving mechanism is assembled between the two auxiliary plates and the support, a mounting groove is formed in the side wall, away from the fixing mechanism, of the support, and a main plate is fixedly connected into the mounting groove. The installation groove is formed in the front side of the support, the main board is installed, the hollow cavity is formed in the support, the two auxiliary boards are installed through the telescopic driving mechanism, the two auxiliary boards can extend out when the writing area of the main board is not enough, the writing area of the blackboard is adjusted, and use is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of teaching tools, and in particular relates to an adjustable blackboard that is easy to use. Background Art

[0002] A blackboard is a teaching tool with a metal frame and a plate covered with a special black or dark green paint inside. It is widely used in primary school, middle school and university teaching.

[0003] The current blackboard generally has a fixed writing area, which may cause the problem of insufficient writing area in some cases.

[0004] In view of this, a kind of easy-to-use adjustable blackboard is designed to solve the above problems. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides an adjustable blackboard which is easy to use and has the characteristics of adjusting the writing area of ​​the blackboard and being convenient to use.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an easy-to-use adjustable blackboard, comprising: a fixing mechanism installed on the wall by screws, the fixing mechanism is fixed with a bracket away from the side wall of the wall, a hollow cavity is opened inside the bracket, two sub-plates are symmetrically arranged inside the hollow cavity, a telescopic driving mechanism is assembled between the two sub-plates and the bracket, the bracket is opened with an installation groove away from the side wall of the fixing mechanism, and a main board is fixed inside the installation groove.

[0007] Furthermore, the fixing mechanism includes two inner fixing frames fixedly connected to the upper and lower side walls of the bracket close to the wall surface and two outer fixing frames sleeved on the sides of the two inner fixing frames away from the bracket, the inner fixing frame is arranged in a U-shaped structure and has two racks symmetrically fixedly connected to the inner wall, a single-headed screw and a follower shaft are arranged inside the outer fixing frame, the top end of the single-headed screw is connected to the top end of the upper outer fixing frame through a bearing, the bottom end of the single-headed screw passes through the upper and lower outer fixing frames and extends to the bottom of the lower outer fixing frame, the single-headed screw is connected to the through section of the outer fixing frame through a bearing, the bottom end of the single-headed screw is fixedly connected to the handle, and the two ends of the follower shaft are connected to the top and bottom ends of the outer fixing frame through bearings, and the single-headed screw and the follower shaft are respectively fixedly sleeved with first gears located in the outer fixing frame, the two first gears are meshingly connected with adjacent racks, and the two first gears are meshingly connected.

[0008] Furthermore, the outer wall of the inner fixing frame is in contact with the inner wall of the outer fixing frame, that is, when the first gear does not rotate, the inner fixing frame cannot be separated from the inner part of the outer fixing frame.

[0009] Furthermore, the telescopic driving mechanism includes two double-headed screws symmetrically arranged inside the hollow cavity, the top end of the double-headed screw on one side is connected to the top end of the bracket through a bearing, the bottom end of one double-headed screw penetrates the bracket and extends to the bottom of the bracket and is connected to the bracket through a bearing, a handle is fixedly connected to the bottom end of the side bracket, and both ends of the double-headed screw on the other side are connected to the top and bottom ends of the bracket through bearings, a linkage mechanism is assembled between the two double-headed screws, two movable seats on the double-headed screw are located in the hollow cavity and are symmetrically connected to each other through a transmission nut, the movable seats on the two double-headed screws are symmetrical to each other, a scissors frame is arranged between the two movable seats on the double-headed screw, the scissors frame and the two movable seats are rotatably connected by a connecting shaft, and a fixing rod is fixedly connected between the shaft and the sub-plate on the side of the scissors frame away from the movable seat.

[0010] Furthermore, the threads of the double-start screw sections are opposite.

[0011] Furthermore, the linkage mechanism includes a second gear fixedly sleeved on the two double-headed screws, and the two second gears are outer-mounted with toothed belts for meshing transmission.

[0012] Furthermore, the installation space of the movable seat in the hollow cavity does not support the movable seat to rotate along the double-headed screw.

[0013] Furthermore, a sliding rod is fixedly connected to the rotating shaft of the scissors frame away from the fixed rod side, and a sliding groove is opened on the inner wall of the bracket corresponding to the position of the sliding rod, and the sliding rod extends into the sliding groove and slides.

[0014] Furthermore, the corners of the bracket and the auxiliary plate are arc-shaped.

[0015] Furthermore, the bracket and the outer edge of the sub-plate are flush.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The front side of the bracket of the present invention is provided with a mounting groove and a main board is installed thereon. A hollow cavity is provided inside the bracket and two sub-boards are installed thereon through a telescopic driving mechanism. When the writing area of ​​the main board is not enough, the two sub-boards can be extended to adjust the writing area of ​​the blackboard for easy use.

[0018] 2. The telescopic drive mechanism of the present invention can realize the telescopic drive of the two sub-plates by rotating the handle of the double-headed screw on one side, which is convenient and fast to operate and easy to use.

[0019] 3. The bracket of the present invention is fixed on the wall by a fixing mechanism, and the fixing mechanism can realize the disassembly and assembly of the bracket by rotating a single-head screw, which is convenient for the maintenance or repair of the blackboard. At the same time, when replacing the blackboard, there is no need to re-drill holes and damage the wall, which is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a front view of the present invention;

[0021] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the telescopic drive mechanism of the present invention;

[0023] Figure 4 It is a back view of the present invention;

[0024] Figure 5 It is a schematic diagram of the fixing mechanism of the present invention;

[0025] In the figure: 1. bracket; 2. mounting slot; 3. main board; 4. hollow cavity; 5. sub-board;

[0026] 101, single-head screw; 102, external fixing frame; 103, internal fixing frame; 104, follower shaft; 105, first gear; 106, rack;

[0027] 201, scissor frame; 202, movable seat; 203, double-headed screw; 204, fixed rod; 205, connecting shaft;

[0028] 301, second gear; 302, toothed belt;

[0029] 401. Sliding groove; 402. Sliding rod. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] The present invention provides the following technical solutions: an easy-to-use adjustable blackboard, comprising: a fixing mechanism installed on the wall by screws, the fixing mechanism is fixed with a bracket 1 away from the side wall of the wall, a hollow cavity 4 is opened inside the bracket 1, two sub-plates 5 are symmetrically arranged inside the hollow cavity 4, a telescopic driving mechanism is assembled between the two sub-plates 5 and the bracket 1, and the bracket 1 is opened with an installation groove 2 away from the side wall of the fixing mechanism, and a main board 3 is fixed inside the installation groove 2.

[0032] In this embodiment, see the attached Figure 1 , mount the bracket 1 on the wall through the fixing mechanism;

[0033] When in use, writing can be done on the main board 3 first. If the area of ​​the main board 3 is not enough for writing, the two sub-boards 5 can be driven to extend out of the hollow cavity 4 by driving the telescopic driving mechanism. At this time, the two sub-boards 5 can expand the writing area of ​​the main board 3 and increase the writing area of ​​the blackboard. At the same time, it is easy to operate and convenient to use.

[0034] Specifically, the fixing mechanism includes two inner fixing frames 103 fixed to the upper and lower side walls of the bracket 1 close to the wall, and two outer fixing frames 102 sleeved on the two inner fixing frames 103 away from the bracket 1. The inner fixing frame 103 is a U-shaped structure and has two racks 106 symmetrically fixed to the inner wall. A single-head screw 101 and a follower shaft 104 are arranged inside the outer fixing frame 102. The top of the single-head screw 101 is connected to the top of the upper outer fixing frame 102 through a bearing, and the bottom of the single-head screw 101 passes through the upper and lower two The external fixer 102 extends to the bottom of the external fixer 102 below, the single-head screw 101 is connected to the through section of the external fixer 102 through a bearing, the bottom end of the single-head screw 101 is fixedly connected to the handle, and the two ends of the follower shaft 104 are connected to the top and bottom ends of the external fixer 102 through bearings, and the single-head screw 101 and the follower shaft 104 are respectively fixedly sleeved in the external fixer 102, and the two first gears 105 are meshed and connected with the adjacent racks 106.

[0035] In this embodiment, see the attached Figure 4-5 The fixing mechanism fixes the two external fixing frames 102 on the wall by screws, aligns the two internal fixing frames 103 with the two external fixing frames 102 and inserts them, rotates the handle of the single-head screw 101, drives the single-head screw 101 to rotate, and the single-head screw 101 drives the two connected first gears 105 to rotate, and the two connected first gears 105 drive the other two meshingly connected first gears 105 to rotate, and the four first gears 105 drive the four racks 106 to move in the direction close to the external fixing frames 102 during the rotation process, and the four racks 106 drive the two internal fixing frames 103 to move in the same direction, and the two internal fixing frames 103 drive the bracket 1 to move in the same direction until the handle of the single-head screw 101 cannot rotate and stops. At this time, the two internal fixing frames 103 abut against the inner walls of the two external fixing frames 102, and the bracket 1 is fixedly installed;

[0036] The bracket 1 can be disassembled by rotating the handle of the single-head screw 101 in the opposite direction.

[0037] Specifically, the outer wall of the inner fixing frame 103 is in contact with the inner wall of the outer fixing frame 102 , that is, when the first gear 105 does not rotate, the inner fixing frame 103 cannot be separated from the inner part of the outer fixing frame 102 .

[0038] In this embodiment, see the attached Figure 5 , which prevents the inner fixing frame 103 from separating from the outer fixing frame 102 and causing the bracket 1 to fall, thereby improving the safety of the blackboard.

[0039] Specifically, the telescopic driving mechanism includes two double-headed screws 203 symmetrically arranged inside the hollow cavity 4, the top of the double-headed screw 203 on one side is connected to the top of the bracket 1 through a bearing, the bottom end of one double-headed screw 203 penetrates the bracket 1 and extends to the bottom of the bracket 1 and is connected to the through section of the bracket 1 through a bearing, a handle is fixedly connected to the bottom end of the side bracket 1, and the two ends of the double-headed screw 203 on the other side are connected to the top and bottom ends of the bracket 1 through bearings, a linkage mechanism is assembled between the two double-headed screws 203, and the double-headed screw 203 is located in the hollow cavity 4 and is symmetrically connected to two movable seats 202 through transmission nuts, the movable seats 202 on the two double-headed screws 203 are symmetrical to each other, a scissors frame 201 is arranged between the two movable seats 202 on the double-headed screw 203, a connecting shaft 205 is rotatably connected between the scissors frame 201 and the two movable seats 202, and a fixing rod 204 is fixedly connected between the shaft on the side of the scissors frame 201 away from the movable seat 202 and the sub-plate 5.

[0040] In this embodiment, see the attached Figure 2-3 The telescopic driving mechanism rotates the handle of the double-headed screw 203 on one side to drive the double-headed screw 203 on one side to rotate, and the double-headed screw 203 on one side drives the double-headed screw 203 on the other side to rotate through the linkage mechanism. During the rotation of the two double-headed screws 203, the two movable seats 202 on the double-headed screw 203 move towards each other. During the movement of the two movable seats 202, the scissor frame 201 is squeezed to extend the scissor frame 201. The two scissor frames 201 drive the two sub-plates 5 to extend out of the hollow cavity 4 through the two fixed rods 204, thereby realizing the extension drive;

[0041] The contraction drive of the auxiliary plate 5 can be achieved by rotating the handle of the double-headed screw 203 on one side in the opposite direction.

[0042] Specifically, the threads of the double-start screw segments of the double-start screw 203 are opposite.

[0043] In this embodiment, see the attached Figure 3 , so as to realize the function of the two movable seats 202 moving in opposite directions on the double-headed screw 203.

[0044] Specifically, the linkage mechanism includes a second gear 301 fixedly sleeved on two double-headed screws 203, and a toothed belt 302 for meshing transmission is sleeved on the two second gears 301.

[0045] In this embodiment, see the attached Figure 3 The linkage mechanism is driven by the double-headed screw 203 on one side to drive the connected second gear 301 to rotate, the connected second gear 301 drives the meshing transmission toothed belt 302 to rotate, the toothed belt 302 drives the other meshing connected second gear 301 to rotate, and the other second gear 301 drives the double-headed screw 203 on the other side to rotate, thereby realizing the linkage of the two double-headed screws 203.

[0046] Specifically, the installation space of the movable seat 202 in the hollow cavity 4 does not support the movable seat 202 to rotate along the double-headed screw 203 .

[0047] In this embodiment, see the attached Figure 1 and 2 , preventing the movable seat 202 from rotating on the double-headed screw 203.

[0048] Specifically, a sliding rod 402 is fixedly connected to the rotating shaft of the scissors frame 201 away from the fixed rod 204 , and a sliding groove 401 is opened at the inner wall of the bracket 1 corresponding to the position of the sliding rod 402 , and the sliding rod 402 extends into the sliding groove 401 and slides.

[0049] In this embodiment, see the attached Figure 1 and 3 During the movement of the scissors frame 201 , the sliding rod 402 is driven to slide in the sliding groove 401 , so as to improve the movement stability of the scissors frame 201 , that is, the movement stability of the auxiliary plate 5 .

[0050] Specifically, the corners of the bracket 1 and the auxiliary plate 5 are arc-shaped.

[0051] In this embodiment, see the attached Figure 1 , avoid scratching people and improve safety of use.

[0052] Specifically, the outer edges of the bracket 1 and the sub-plate 5 are flush.

[0053] In this embodiment, see the attached Figure 1 , beautiful shape.

[0054] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable blackboard that is easy to use, characterized in that: include: A fixing mechanism is installed on a wall surface by screws, the fixing mechanism is fixedly connected to a bracket (1) away from the side wall of the wall surface, a hollow cavity (4) is provided inside the bracket (1), two sub-plates (5) are symmetrically arranged inside the hollow cavity (4), a telescopic driving mechanism is assembled between the two sub-plates (5) and the bracket (1), and a mounting groove (2) is provided on the side wall of the bracket (1) away from the fixing mechanism, and a main board (3) is fixedly connected inside the mounting groove (2).

2. The adjustable blackboard according to claim 1 is characterized in that: The fixing mechanism comprises two inner fixing frames (103) fixedly connected to the upper and lower side walls of the bracket (1) close to the wall, and two outer fixing frames (102) sleeved on the two inner fixing frames (103) away from the bracket (1); the inner fixing frames (103) are arranged in a U-shaped structure and have two racks (106) symmetrically fixedly connected to the inner wall; a single-head screw (101) and a follower shaft (104) are arranged inside the outer fixing frames (102); the top end of the single-head screw (101) is connected to the top end of the upper outer fixing frame (102) through a bearing; the bottom end of the single-head screw (101) passes through the two upper and lower outer fixing frames (103); The fixing frame (102) extends to the lower side of the external fixing frame (102), the single-head screw (101) is connected to the through section of the external fixing frame (102) via a bearing, the bottom end of the single-head screw (101) is fixedly connected to the handle, and the two ends of the follower shaft (104) are connected to the top and bottom ends of the external fixing frame (102) via bearings, and the single-head screw (101) and the follower shaft (104) are respectively fixedly sleeved with first gears (105) located in the external fixing frame (102), and the two first gears (105) are meshedly connected with adjacent racks (106). The two first gears (105) are meshedly connected.

3. The adjustable blackboard according to claim 2 is characterized in that: The outer wall of the inner fixing frame (103) is in contact with the inner wall of the outer fixing frame (102), that is, when the first gear (105) does not rotate, the inner fixing frame (103) cannot be separated from the inside of the outer fixing frame (102).

4. The easy-to-use adjustable blackboard according to claim 1 is characterized by: The telescopic drive mechanism comprises two double-headed screws (203) symmetrically arranged inside the hollow cavity (4), the top end of the double-headed screw (203) on one side being connected to the top end of the bracket (1) via a bearing, the bottom end of the double-headed screw (203) passing through the bracket (1) and extending to the bottom of the bracket (1) and being connected to the through section of the bracket (1) via a bearing, a handle being fixedly connected to the bottom end of the bracket (1), and both ends of the double-headed screw (203) on the other side being connected to the top and bottom ends of the bracket (1) via bearings, a linkage mechanism being arranged between the two double-headed screws (203), and the Two movable seats (202) are symmetrically connected to the double-headed screw (203) in the hollow cavity (4) via a transmission nut. The movable seats (202) on the two double-headed screws (203) are symmetrical to each other. A scissor frame (201) is provided between the two movable seats (202) on the double-headed screw (203). A connecting shaft (205) is rotatably connected between the scissor frame (201) and the two movable seats (202). A fixing rod (204) is fixedly connected between the shaft on the side of the scissor frame (201) away from the movable seat (202) and the auxiliary plate (5).

5. The adjustable blackboard according to claim 4 is characterized in that: The double-start screw (203) has double-start screw sections with opposite threads.

6. The easy-to-use adjustable blackboard according to claim 4, characterized in that: The linkage mechanism comprises a second gear (301) fixedly sleeved on two double-headed screws (203), and the outer surfaces of the two second gears (301) are sleeved with toothed belts (302) for meshing transmission.

7. The easy-to-use adjustable blackboard according to claim 4, characterized in that: The installation space of the movable seat (202) in the hollow cavity (4) does not support the movable seat (202) to rotate along the double-headed screw (203).

8. The easy-to-use adjustable blackboard according to claim 4, characterized in that: A sliding rod (402) is fixedly connected to the rotating shaft of the scissor frame (201) away from the fixed rod (204), and a sliding groove (401) is provided on the inner wall of the bracket (1) at a position corresponding to the sliding rod (402), and the sliding rod (402) extends into the sliding groove (401) to slide.

9. The easy-to-use adjustable blackboard according to claim 1, characterized in that: The corners of the support (1) and the auxiliary plate (5) are arc-shaped.

10. The easy-to-use adjustable blackboard according to claim 1, characterized in that: The outer edges of the bracket (1) and the auxiliary plate (5) are flush.

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