CN2575785Y - Flag stand apparatus - Google Patents
Flag stand apparatus Download PDFInfo
- Publication number
- CN2575785Y CN2575785Y CN 02280423 CN02280423U CN2575785Y CN 2575785 Y CN2575785 Y CN 2575785Y CN 02280423 CN02280423 CN 02280423 CN 02280423 U CN02280423 U CN 02280423U CN 2575785 Y CN2575785 Y CN 2575785Y
- Authority
- CN
- China
- Prior art keywords
- ruler
- rulers
- length
- theorem
- screw
- 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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- Drawing Aids And Blackboards (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The utility model relates to a geometric drawing ruler of a teaching aid, which is formed by the connection of eighteen rulers that are laminated end to end, wherein, the length of the front seventeen rulers is the same. The front end of a first ruler is provided with a screw hole, and the rear end of the eighteenth ruler is provided with a lengthened screw hole. The geometric drawing ruler can be connected from an open state to a closed state through a screw and a manual nut. Angular measuring scale lines, transverse midlines and length scales, which are uniformly distributed in circumferential direction are arranged at the surrounding connection point position of the left side of the front of each ruler. Back faces of the previous eleven rulers are provided with circular arc lines and scales, and the back faces of the rest rulers are provided with the transverse midlines and length scales. Various plane figures can be formed by relation between a line segment and a line segment in a plane by the utility model through the change positions of rulers; a ruler, a set square and a graphometer can be replaced, circle ratio can be calculated, the pythagorean proposition, the crossed string theorem, the centre of gravity theorem and the projective theorem can be illustrated, and the utility model can also be used for deriving the formulas of area of a circle and demonstrating the formula derivation process of the area of the circle.
Description
Technical field the utility model relates to a kind of teaching aid, can also be as the toy for children of tap intellectual resources---the composition of geometry chi.
Background technology is present, and primary and secondary students' mathematics, how much study stationery commonly used have ruler, set square, graphometer etc., and these stationery only can be as a requisite schooling apparatus.
Summary of the invention the utility model composition of geometry chi, can impart rudimentary knowledge to beginners children's geometrical concept, its objective is in, primary school teaching provides a kind of and can be used for auxiliary teaching aid---the composition of geometry chi that calculates plane geometry theorem such as circular constant, derivation area formula of circle, secondary proof Pythagorean theorem, special triangle theorem and replace ruler, set square, graphometer.
The utility model composition of geometry chi content Description:
The utility model composition of geometry chi, it is characterized in that: be by 18 folded mutually being formed by connecting of ruler head and the tail, ruler can adopt stainless steel or plastics, plank to make, the length of wherein preceding 17 rulers is identical, front end at first ruler is provided with screw, the rear end of the 18 ruler is provided with a lengthening screw, has increased its length, can make the composition of geometry chi connect into closure state by open state by screw, manual nut; Each ruler can rotate, bends and stretches, fold the multiple geometric figure of formation around tie point; The front of ruler: around the tie point place, have at circumferencial direction with the uniform angle measuring calibration line in 15 ° of angles and have horizontal center line and the length scale in the left side in the front of each ruler; The back side of ruler: have circular arc line and scale at the back side of preceding 11 rulers, can form a semi arch, be carved with horizontal center line and length scale at the back side of remaining 7 ruler, form diameter by them by 11 circular arc lines.
The utility model composition of geometry chi is as a kind of teaching aid, by changing the position of ruler, can constitute the relation between the line segment and line segment in the plane, as parallel, vertical etc.; Constitute various planar graphs, as angle, corresponding angle, alternate interior angle, triangle, polygon etc.; Can replace ruler, set square, graphometer; Can constitute semicircle, calculate circular constant; The formation length of side is that 3: 4: 5 triangle illustrates Pythagorean theorem; Constitute an interior angle and be 30 ° right-angle triangle, 30 ° of angles of demonstration right right-angle side equal 1/2nd of hypotenuse; Constitute triangle and neutrality line thereof, illustrate that neutrality line equals 1/2nd of base; Constitute triangle and exterior angle thereof, the relation at interior angle and exterior angle is described; Utilize two covers, how much composition chis, can the aid illustration intersecting chord theorem, theorem of center, projective theorem; The area formula of circle of can deriving, demonstration area formula of circle derivation.
Description of drawings Fig. 1 is open state (front) composition of geometry chi structural representation
Fig. 2 is open state (back side) composition of geometry chi structural representation
Fig. 3 is a closure state composition of geometry chi structural representation
Fig. 4 is the ruler structural drawing that has angle line
Fig. 5 is the ruler structural drawing that has circular arc line
Fig. 6 is the ruler structural drawing that has horizontal center line
Among the figure: 1 is that ruler, 2 for angle measuring calibration line, 8 for horizontal center line, 9 for circular arc line, 10 is horizontal center line for tie point, 7 for screw, 5 for manual nut, 6 for lengthening screw 4 for screw, 3.
Embodiment the utility model composition of geometry chi is to realize like this, see Fig. 1 open state (front) composition of geometry chi, Fig. 2 open state (back side) composition of geometry chi, Fig. 3 closure state composition of geometry chi, the composition of geometry chi is by 18 folded mutually being formed by connecting of ruler head and the tail, ruler 1 can adopt stainless steel or plastics, plank is made, the length of wherein preceding 17 rulers is identical, front end at first ruler is provided with screw 2, the rear end of the 18 ruler is provided with a lengthening screw 3, increased its length, by screw 4, manually nut 5 can make the composition of geometry chi connect into closure state by open state.Each ruler can rotate, bends and stretches, fold the multiple geometric figure of formation around tie point 6.See that Fig. 4 has the ruler of angle line, around the tie point place, have at circumferencial direction with the uniform angle measuring calibration line 7 in 15 ° of angles and have horizontal center line 8 and length scale in the left side in the front of each ruler.See that Fig. 5 has the ruler of circular arc line, have circular arc line 9 and scale, can connect to form a semi arch by 11 circular arc lines at the back side of preceding 11 rulers.See that Fig. 6 has the ruler of horizontal center line, be carved with horizontal center line 10 and length scale at the back side of remaining 7 ruler, form diameter by them.
Claims (1)
1, a kind of composition of geometry chi, it is characterized in that: be by 18 folded mutually being formed by connecting of ruler head and the tail, ruler can adopt stainless steel or plastics, plank to make, the length of wherein preceding 17 rulers is identical, front end at first ruler is provided with screw, the rear end of the 18 ruler is provided with a lengthening screw, has increased its length, can make the composition of geometry chi connect into closure state by open state by screw, manual nut; The front of ruler: around the tie point place, have at circumferencial direction with the uniform angle measuring calibration line in 15 ° of angles and have horizontal center line and the length scale in the left side in the front of each ruler; The back side of ruler: have circular arc line and scale at the back side of preceding 11 rulers, be carved with horizontal center line and length scale at the back side of remaining 7 ruler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02280423 CN2575785Y (en) | 2002-10-10 | 2002-10-10 | Flag stand apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02280423 CN2575785Y (en) | 2002-10-10 | 2002-10-10 | Flag stand apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2575785Y true CN2575785Y (en) | 2003-09-24 |
Family
ID=33743154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02280423 Expired - Fee Related CN2575785Y (en) | 2002-10-10 | 2002-10-10 | Flag stand apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2575785Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112572029A (en) * | 2019-09-30 | 2021-03-30 | 田中毅彦 | Portable folding form ruler |
-
2002
- 2002-10-10 CN CN 02280423 patent/CN2575785Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112572029A (en) * | 2019-09-30 | 2021-03-30 | 田中毅彦 | Portable folding form ruler |
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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 |