Multifunctional circle drawing teaching aid
A multifunctional and teaching aid technology, applied in the field of teaching aids, can solve the problems of complex structure, single function, inconvenient size adjustment, etc., and achieve the effect of low cost and simple structure
Active Publication Date: 2013-09-18
SUZHOU VOCATIONAL UNIV
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- Description
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is how to solve the problem of single function, inconvenient size adjustment and complex structure of the existing circle-making teaching aids
Method used
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[0024] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0025] like Figure 1 to Figure 7 The shown multi-functional circle making teaching aid includes a fixed connecting piece 1, a pair of grooved rods 2, and a pair of draw rods 3. A handle 101 is provided on the fixed connector 1 .
[0026] One end of each grooved rod 2 is provided with a gear 201, the two gears 201 mesh with each other, assembled in the fixed connector 1, and can rotate freely, the two grooved rods 2 can be opened to 0°~180°, or combined in Together. Each grooved bar 2 is provided with a scale.
[0027] Each pull rod 3 includes a sliding slot 301 , a fixing device 302 and a wire 303 . The sliding groove 301 is connected with the grooved rod 2 and can m...
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The invention discloses a teaching aid, and particularly relates to a multifunctional circle drawing teaching aid. The multifunctional circle drawing teaching aid comprises a fixed connection member, a pair of groove-shaped rods, draw-and-pull rods and fixing devices, wherein gears are arranged at one ends of the groove-shaped rods arranged in the fixed connection member, the gears are mutually meshed, and with the rotation of gears, the groove-shaped rods can be opened or closed; the draw-and-pull rods are respectively connected to the groove-shaped rods through sliding grooves, and move along the long sides of the groove-shaped rods, and rotary rods for jointing with a work plane are arranged at the ends of the draw-and-pull rods, and can rotate around the ends of the draw-and-pull rods; and the fixing devices are arranged at the ends of the draw-and-pull rods, and are connected by threads, and chalk holes are formed in the ends of the rotation rods, and used for placing chalk. The multifunctional circle drawing teaching aid can draw a circle and an ellipse by rotating angles of the groove-shaped rods, can realize dual purposes, and is simple in structure and lower in cost; and during drawing the ellipse, the focal length of the ellipse and the size of a short shaft can be conveniently adjusted.
Description
technical field [0001] The invention relates to a teaching tool, in particular to a multi-functional circle-making teaching tool. Background technique [0002] In middle school mathematics teaching, teachers need to draw some circles and ellipses for teaching. In order to make the graphics more accurate, they need teaching aids to complete the pattern drawing. At present there have been teaching aids for drawing circles or ellipses, but there has not been a tool that can draw both circles and ellipses. Moreover, the existing teaching aids for drawing ellipses are either difficult to adjust in size or have too complicated structures. Therefore, a teaching aid that can draw circles and ellipses, is convenient in size adjustment, and has a simple structure is needed. Contents of the invention [0003] The technical problem to be solved by the invention is how to solve the problems of single function, inconvenient size adjustment and complex structure of the existing circle-m...
Claims
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IPC IPC(8): B43L13/00
Inventor 刘爽赵云汪震邢艳玲赵海燕
Owner SUZHOU VOCATIONAL UNIV