CN2164580Y - Trigonometrid function board - Google Patents
Trigonometrid function board Download PDFInfo
- Publication number
- CN2164580Y CN2164580Y CN 93223213 CN93223213U CN2164580Y CN 2164580 Y CN2164580 Y CN 2164580Y CN 93223213 CN93223213 CN 93223213 CN 93223213 U CN93223213 U CN 93223213U CN 2164580 Y CN2164580 Y CN 2164580Y
- Authority
- CN
- China
- Prior art keywords
- garden
- base plate
- montant
- unit
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to mathematical teaching aid, which is an ideal teaching (learning) aid and can quickly and accurately find out the values of the sine, the cosine, the tangent and the cotangent of the direct trigonometric function and inverse trigonometric function the utility model is characterized in that a rotatable long indicating needle (2) is connected with the center of a circle on the back of a base board; the other end of the indicating needle is folded towards the front face at the edge of the base board, and is connected in a through groove (3) on a vertical rod by screws at a unit circle; the graduated vertical rod is fixedly connected with a trapezoidal block (4); the vertical rod is bisected into two equal parts, taking the fixing point as the boundary; the trapezoidal block is movably connected with a groove (5) positioned on the X coordinate axis on the base board.
Description
The utility model relates to mathematics teaching aid, is a kind of ideal religion () tool of learning trigonometric function.
Existing this type of trigonometric function plate teaching aid, complex structure, function is incomplete, uses inconvenient.
The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and a kind of trigonometric function plate is provided, it can just found quickly and accurately, cosine and just, four positive and negative trigonometric function values of cotangent.
The purpose of utility model can reach by following measure: the heart place, garden that a rotating Long pointer is connected in the base plate back side, this pointer other end is folded to the front at the bottom edge place, be connected in the groove of a montant by screw during to the unit garden, graduated montant and trapezoid block are fixed together, with this point of fixity is the boundary, montant is split equal two partly, trapezoid block be positioned at base plate on the groove at x axes of coordinates place be connected movingly.
There is the fundamental figure of plane geometry, solid geometry, cartesian geometry in the peripheral vacancy of base plate.
Pointer, montant above the base plate are made with transparent plastic, and figure and slide-rule dial line can be drawn with different colours.
Fig. 1 is a structural representation of the present utility model.
This trigonometric function plate has a garden shape base plate (1), be shaped on the angle index value of 0～360 degree at its marginal belt, the unit of being painted with garden above the base plate, rectangular coordinate system with x, the y axle is parallel and with the unit tangent straight line in garden, on this straight line scale is arranged, be the number axis tangent line in unit garden: positive tangent x=1, cotangent line y=1, the initial point of rectangular coordinate system overlaps with the garden heart in unit garden, all is positioned at the center of base plate; Rotary indicator (2) one ends at the base plate back side are connected in heart place, garden, and the other end is connected in the groove on the montant (3) in base plate front, and can slide up and down therein.The stage casing that is positioned at x axle on the base plate has trapezoidal elongated slot (5), and the trapezoid block (4) that is connected in the montant mid point is positioned at dovetail groove and can horizontally slips the translation of drive montant within it.
Rotary indicator is during to any angle α, and the pronunciation of each trigonometric function value is: the y coordinate of montant and pointer point of fixity is sin α, and the x coordinate is cos α; The y coordinate of pointer and vertical positive tangent joining P is tg α, with the x coordinate of the cotangent line joining Q of level be ctg α.
This plate can be made teaching aid, learning aid, looks into positive and negative trigonometric function value; The trigonometric function value at special angle obviously marks on the function plate, is convenient to student's memorize; By pointer rotation, montant translation, the student can be by observing and thinking, carry out the teaching and the study of trigonometric function visual in imagely, help the student to understand and grasp the variation relation of angle and function value in each quadrant, help the student the understand and master of trigonometric function character and more firm memory.This plate simple structure, easy to manufacture, very easily operation, the value of looking into rapidly accurately.Be association of activity and inertia, have and in the thinking ability of cultivating the student.
Claims (3)
1, a kind of trigonometric function plate of using as teaching aid, garden shape base plate (1) is arranged, be shaped on the angle index value of 0～360 degree at its marginal belt, the unit of being painted with garden above the base plate, rectangular coordinate system and and x, the y axle parallel and with the unit tangent straight line in garden, the initial point of rectangular coordinate system overlaps with the garden heart in unit garden, it is characterized in that having a rotating Long pointer (2) to be connected in the heart place, garden at the base plate back side, this pointer other end is folded to the front at the bottom edge place, be connected in the groove (3) on the montant by screw during to the unit garden, graduated montant and trapezoid block (4) are fixed together, with this point of fixity is the boundary, montant is split equal two partly, trapezoid block be positioned at base plate on the groove (5) at x axes of coordinates place be connected movingly.
2, function plate according to claim 1, there is the fundamental figure of plane geometry, solid geometry, cartesian geometry in the peripheral vacancy that it is characterized in that base plate.
3, function plate according to claim 1 is characterized in that pointer, the montant above the base plate made with transparent plastic, and figure and slide-rule dial line can be drawn with different colours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93223213 CN2164580Y (en) | 1993-08-28 | 1993-08-28 | Trigonometrid function board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93223213 CN2164580Y (en) | 1993-08-28 | 1993-08-28 | Trigonometrid function board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2164580Y true CN2164580Y (en) | 1994-05-11 |
Family
ID=33801601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93223213 Expired - Fee Related CN2164580Y (en) | 1993-08-28 | 1993-08-28 | Trigonometrid function board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2164580Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101853594A (en) * | 2010-05-19 | 2010-10-06 | 周维保 | Function calculating disc |
| CN104332085A (en) * | 2014-11-25 | 2015-02-04 | 南京工业职业技术学院 | Anti-tangent, cotangent, secant and cosecant function demonstrating and graph drawing instrument |
-
1993
- 1993-08-28 CN CN 93223213 patent/CN2164580Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101853594A (en) * | 2010-05-19 | 2010-10-06 | 周维保 | Function calculating disc |
| CN104332085A (en) * | 2014-11-25 | 2015-02-04 | 南京工业职业技术学院 | Anti-tangent, cotangent, secant and cosecant function demonstrating and graph drawing instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |