Hand-rocking type up-down shifting blackboard
A hand-crank, blackboard technology, applied in the blackboard field, can solve problems such as affecting learning efficiency, students' inability to understand coherently and smoothly, and unable to meet writing requirements, and achieve the effect of easy use.
Inactive Publication Date: 2016-08-10
徐兵
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Problems solved by technology
[0003] Affected by the teacher's height, the utilization rate of the blackboard varies, resulting in the inability to meet the writing requirements when explaining the subject, making students unable to understand coherently and smoothly, and affecting learning efficiency
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[0013] Such as figure 1 As shown, the present invention includes an outer frame 1, which is characterized in that guide gears 2 are arranged inside the four corners of the outer frame 1, and the guide gear 2 is connected up and down by a chain 11, and a tensioning ratchet is arranged on the lower left side of the outer frame 1 3. The right side of the tensioning ratchet 3 meshes with the chain 11, the outer frame 1 is provided with an upper blackboard 4 and a lower blackboard 5, and the four corners of the lower blackboard 5 are provided with hanging lugs 6, and the chain 11 and the hanging lugs 6 connection, the two hanging lugs 6 on the upper side of the lower blackboard 5 are also connected with a traction line 7, the upper side of the upper blackboard 4 is provided with lifting lugs 8 on the left and right sides, and the upper side of the lifting lugs 8 is provided with guide pulleys 9 , the traction line 7 is connected to the lifting lug 8 through the guide pulley 9, and ...
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The invention discloses a hand-rocking type up-down shifting blackboard. The hand-rocking type up-down shifting blackboard comprises an outer frame and is characterized in that guide gears are arranged on the inner sides of the four corners of the outer frame correspondingly and connected up and down through chains; a tightening ratchet wheel is arranged on the lower left side of the outer frame; the right side of the tightening ratchet wheel meshes with the corresponding chain; an upper blackboard body and a lower blackboard body are arranged in the outer frame; hanging lugs are arranged at the four corners of the lower blackboard body correspondingly; the chain is connected with the hanging lugs; a pull wire is further connected with the left hanging lug and the right hanging lug which are arranged on the upper side of the lower blackboard body; lifting lugs are arranged on the left and the right of the upper side of the upper blackboard body correspondingly; guide pulleys are arranged on the upper sides of the lifting lugs correspondingly; the pull wire is connected with the lifting lugs through the guide pulleys; and a handle is arranged on the front side of the tightening ratchet wheel. The hand-rocking type up-down shifting blackboard has the beneficial effects that the blackboard goes up and down through hand rocking, so that the blackboard is convenient to use and suitable for meeting the needs of lecturers with different heights, and the utilization efficiency of the blackboard is improved.
Description
technical field [0001] The invention relates to a blackboard, in particular to a hand-operated up and down shifting blackboard. Background technique [0002] The blackboard does not specifically refer to the black board surface. In the traditional sense, it is a plane that can be written repeatedly. The board surface is hard and is mostly used for teaching. Made of wood or frosted glass, etc., you can write on it with specific writing materials such as chalk. Mostly black, dark green, white or beige. [0003] Affected by the teacher's height, the utilization rate of the blackboard varies, resulting in the inability to meet the writing requirements when explaining the subject, making students unable to understand coherently and smoothly, and affecting learning efficiency. Contents of the invention [0004] The object of the present invention is to provide a blackboard that can be raised and lowered by hand without being affected by the teacher's height. [0005] In order...
Claims
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IPC IPC(8): B43L1/04
CPCB43L1/04
Inventor 徐兵
Owner 徐兵