CN203063418U - Teaching appliance for scribing ellipse in one step to demonstrate ellipse definition - Google Patents
Teaching appliance for scribing ellipse in one step to demonstrate ellipse definition Download PDFInfo
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- CN203063418U CN203063418U CN 201320082189 CN201320082189U CN203063418U CN 203063418 U CN203063418 U CN 203063418U CN 201320082189 CN201320082189 CN 201320082189 CN 201320082189 U CN201320082189 U CN 201320082189U CN 203063418 U CN203063418 U CN 203063418U
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- rule
- shrinkage
- scale
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- ellipse
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Abstract
The utility model discloses a teaching appliance for scribing an ellipse in one step to demonstrate ellipse definition. The teaching appliance comprises a horizontal flat tube shaped fixed scale and a rotary scale; extension scales are arranged at the end parts in the horizontal flat tube shaped fixed scale; focus point positioning pins are arranged at the outer end of the extension scale; a rotation end shaft of the rotary scale is fixed at the middle part of an upper board of the horizontal flat tube shaped fixed scale; an elastic automatic extension scale is arranged in the rotary scale; and two ends of a fixed-length rope are respectively fixed at the bottom ends of a left focus point positioning pin and a right focus point positioning pin. The teaching appliance is characterized in that a fixing batten of the elastic automatic expansion scale is arranged at the outer end of the elastic automatic expansion scale; a gear-type whiting box is arranged at the bottom end of the fixing batten; and the fixed-length rope bypasses the bottom end of the fixing batten. The teaching appliance can be used for scribing a collected graph of points that have fixed lengths from the distances to the two focus points in one step to be convenient for students to know the ellipse definition more visually, so that the teaching quality is improved, and moreover, the structure is simple, time and labor are saved, and the scribing is quick.
Description
Technical field
The utility model relates to a kind of high school mathematics teaching apparatus, specifically a kind of disposable teaching demonstration apparatus that marks the circle definition.
Background technology
In high school mathematics teaching, " ellipse " is a chapter wherein.In these chapters and sections, at first will say the definition of " ellipse ", retell the character of " ellipse " then.For the definition of " ellipse ", can say for: with the track distance of two fixed points and that equal the point of a constant, be called ellipse in the plane.Wherein, said two fixed points are two oval focuses, said constant be on the track of ellipse all the equating apart from sum of any point to two focus, and any point to two focus apart from sum greater than the distance between two focuses.At present, teacher when saying oval definition, usually with blackboard as a plane, and fix two focuses, use single line as the fixed length line then, adopt a chalk with fixed length line stretching, the state underscore at stretching fixed length line can mark ellipse.The definition of this diagram ellipse, can not with the track combination of point, it is abstract that the student still feels, the concept of track of embodiment point that can not image.Through retrieval, have not yet to see to adopt and draw a point, vivider the demonstration equipment of understanding oval definition.
Summary of the invention
The purpose of this utility model be to provide a kind of time saving and energy saving, quick, can adopt and draw a point, be convenient to the disposable teaching demonstration apparatus that marks oval definition that the student understands " ellipse " definition vividerly.
In order to reach above purpose, the technical scheme that the utility model adopts is: this disposable teaching demonstration apparatus that marks oval definition, comprise horizontal flat tube shape fixed ruler and rotary ruler, left and right end in horizontal flat tube shape fixed ruler is respectively equipped with left shrinkage-rule and right shrinkage-rule, is respectively equipped with left focus pilot pin and right focus pilot pin perpendicular to left shrinkage-rule and right shrinkage-rule in the outer end of left shrinkage-rule and right shrinkage-rule; The rotation end axle of rotary ruler is fixed on the upper face middle part of horizontal flat tube shape fixed ruler, in rotary ruler, be provided with the automatic shrinkage-rule of elastic force, the two ends of fixed length rope are separately fixed at the bottom of left focus pilot pin and right focus pilot pin, it is characterized in that: be provided with the fixedly batten perpendicular to the automatic shrinkage-rule of elastic force in the outer end of the automatic shrinkage-rule of elastic force, be provided with gear type white powder powder box in the fixing bottom of batten, the fixed length rope is walked around the fixedly bottom of batten, and by fixing batten stretching.
The utility model is also implemented by following measure: the plane of described gear type white powder powder box is perpendicular to the automatic shrinkage-rule of elastic force, each tooth top of gear type white powder powder box all has flour opening, axle at gear type white powder powder box is provided with the press-powder wind spring, the inner of press-powder wind spring and its axle are fixing, and the chamber inside and outside wall of gear type white powder powder box is resisted in the outer end of press-powder wind spring.
The inner of the automatic shrinkage-rule of described elastic force connects upper spring, can regulate transformation between long axis of ellipse and the minor axis automatically by spring, and this is known technology.
Distance between the adjacent flour opening on the described gear type white powder powder box is 5-10mm, gear type white powder powder box root radius 10-20mm.
The beneficial effects of the utility model are: with at present in the definition of high school mathematics " ellipse " teaching institute's use teaching aid compare, can disposablely mark between relative two focuses apart from the sum fixed length the set figure of point, be convenient to the student and understand oval definition vividerly, improve the quality of teaching, and simple in structure, time saving and energy saving, draw figure fast.
Description of drawings
Fig. 1 is structure front-view schematic diagram of the present utility model;
Fig. 2 is structure schematic top plan view of the present utility model;
Fig. 3 is the enlarged diagram of analysing and observe of gear type white powder powder box of the present utility model.
Among the figure: 1, horizontal flat tube shape fixed ruler; 2, rotary ruler; 3, left shrinkage-rule; 4, right shrinkage-rule; 5, left focus pilot pin; 6, right focus pilot pin; 7, rotate the end axle; 8, the automatic shrinkage-rule of elastic force; 9, fixed length rope; 10, fixing batten; 11, gear type white powder powder box; 12, flour opening; 13, axle; 14, press-powder wind spring.
The specific embodiment
Make the utility model with reference to Fig. 1, Fig. 2, Fig. 3.This disposable teaching demonstration apparatus that marks oval definition, comprise horizontal flat tube shape fixed ruler 1 and rotary ruler 2, left side in horizontal flat tube shape fixed ruler 1, right-hand member is respectively equipped with left shrinkage-rule 3 and right shrinkage-rule 4, be respectively equipped with left focus pilot pin 5 and right focus pilot pin 6 perpendicular to left shrinkage-rule 3 and right shrinkage-rule 4 in the outer end of left shrinkage-rule 3 and right shrinkage-rule 4, by a left side, right shrinkage- rule 3,4 equidistant stretching, but the distance between two focuses of the drawn ellipse of rapid adjustment, and can pass through horizontal flat tube shape fixed ruler 1 and left shrinkage-rule 3, reader on the right shrinkage-rule 4 calculate between two focuses apart from length; The rotation end axle 7 of rotary ruler 2 is fixed on the upper face middle part of horizontal flat tube shape fixed ruler 1, in rotary ruler 2, be provided with the automatic shrinkage-rule 8 of elastic force, the two ends of fixed length rope 9 are separately fixed at the bottom of left focus pilot pin 5 and right focus pilot pin 6, it is characterized in that: be provided with the fixedly batten 10 perpendicular to the automatic shrinkage-rule 8 of elastic force in the outer end of the automatic shrinkage-rule 8 of elastic force, be provided with gear type white powder powder box 11 in the fixing bottom of batten 10, fixed length rope 9 is walked around the fixedly bottom of batten 10, and by fixing batten 10 stretchings, because the effect of the automatic shrinkage-rule 8 of elastic force, so no matter where rotary ruler 2 turns to, fixing batten 10 stretching fixed length rope 9 always.When using the utility model, left focus pilot pin 5 and right focus pilot pin 6 are positioned on the blackboard plane, namely in a plane, gear type white powder powder box 11 touches blackboard, rotate rotary ruler 2, gear type white powder powder box 11 can mark dotted line at blackboard, and each point is the length of fixed length rope 9 to left focus pilot pin 5 and right focus pilot pin 6 apart from sum, is half of ellipse; Then, the rotary ruler 2 that reverses again, fixed length rope 9 still around the fixing bottom of batten 10, rotate rotary ruler 2 again, and gear type white powder powder box 11 can mark the oval dotted line of opposite side at blackboard; When gear type white powder powder box 11 repeated to draw, point was infinitely intensive, ellipse.
As improvement of the present utility model: the plane of described gear type white powder powder box 11 is perpendicular to the automatic shrinkage-rule 8 of elastic force, to keep gear type white powder powder box 11 along oval tangent line rolling, each tooth top of gear type white powder powder box 11 all has flour opening 12, axle 13 at gear type white powder powder box 11 is provided with press-powder wind spring 14, the inner of press-powder wind spring 14 and its axle 13 are fixing, the chamber inside and outside wall of gear type white powder powder box 11 is resisted in the outer end of press-powder wind spring 14, make the white powder of gear type white powder powder box 11 to the direction extruding of flour opening 12 by press-powder wind spring 14, flour opening 12 has just stayed the white powder point at blackboard, white powder point can be unlimited intensive, become ellipse, diagram like this, the definition of the understanding ellipse that the student more can be vivid.
The inner of the automatic shrinkage-rule 8 of described elastic force connects upper spring, can regulate transformation between long axis of ellipse and the minor axis automatically by spring, and this is known technology.
Distance between the adjacent flour opening 12 on the described gear type white powder powder box 11 is 5-10mm, gear type white powder powder box 11 root radius 10-20mm.
Claims (2)
1. the disposable teaching demonstration apparatus that marks oval definition, comprise horizontal flat tube shape fixed ruler (1) and rotary ruler (2), left and right end in horizontal flat tube shape fixed ruler (1) is respectively equipped with left shrinkage-rule (3) and right shrinkage-rule (4), is respectively equipped with left focus pilot pin (5) and right focus pilot pin (6) perpendicular to left shrinkage-rule (3) and right shrinkage-rule (4) in the outer end of left shrinkage-rule (3) and right shrinkage-rule (4); The rotation end axle (7) of rotary ruler (2) is fixed on the upper face middle part of horizontal flat tube shape fixed ruler (1), in rotary ruler (2), be provided with the automatic shrinkage-rule of elastic force (8), the two ends of fixed length rope (9) are separately fixed at the bottom of left focus pilot pin (5) and right focus pilot pin (6), it is characterized in that: be provided with the fixedly batten (10) perpendicular to the automatic shrinkage-rule of elastic force (8) in the outer end of the automatic shrinkage-rule of elastic force (8), be provided with gear type white powder powder box (11) in the fixing bottom of batten (10), fixed length rope (9) is walked around the fixedly bottom of batten (10).
2. the disposable teaching demonstration apparatus that marks oval definition according to claim 1, it is characterized in that: the plane of described gear type white powder powder box (11) is perpendicular to the automatic shrinkage-rule of elastic force (8), each tooth top of gear type white powder powder box (11) all has flour opening (12), axle (13) at gear type white powder powder box (11) is provided with press-powder wind spring (14), the inner of press-powder wind spring (14) and its axle (13) are fixing, and the chamber inside and outside wall of gear type white powder powder box (11) is resisted in the outer end of press-powder wind spring (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320082189 CN203063418U (en) | 2013-02-22 | 2013-02-22 | Teaching appliance for scribing ellipse in one step to demonstrate ellipse definition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320082189 CN203063418U (en) | 2013-02-22 | 2013-02-22 | Teaching appliance for scribing ellipse in one step to demonstrate ellipse definition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203063418U true CN203063418U (en) | 2013-07-17 |
Family
ID=48762238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320082189 Expired - Fee Related CN203063418U (en) | 2013-02-22 | 2013-02-22 | Teaching appliance for scribing ellipse in one step to demonstrate ellipse definition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203063418U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111497502A (en) * | 2020-04-28 | 2020-08-07 | 西安工程大学 | Mathematical ellipse drawing tool |
-
2013
- 2013-02-22 CN CN 201320082189 patent/CN203063418U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111497502A (en) * | 2020-04-28 | 2020-08-07 | 西安工程大学 | Mathematical ellipse drawing tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20140222 |