CN2700991Y

CN2700991Y - Multipurpose geometry demonstration instrument

Info

Publication number: CN2700991Y
Application number: CN 200420036082
Authority: CN
Inventors: 周为
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-04
Filing date: 2004-06-04
Publication date: 2005-05-18
Anticipated expiration: 2014-06-04

Abstract

The utility model discloses a multipurpose geometry demonstration device, relating to the field of the writing or the drawing apparatus. The multipurpose geometry demonstration device has the advantages of multiple purposes, convenient operation, simple structure and convenient portability. The multipurpose geometry demonstration device comprises a main ruler, a rotary auxiliary ruler and a movable auxiliary ruler. The utility model is characterized in that slide ways are arranged respectively on the main ruler and the rotary auxiliary ruler, and the main ruler is hinged with the rotary auxiliary ruler through screw bolts. Both ends of the movable auxiliary ruler are provided respectively with the screw bolts which are perforated into the slide way of the main ruler and the slide way of the rotary auxiliary ruler, the slide structure with the cross shape can be formed, and the main ruler is fixed with a chalk clamp tube. A compasses leg is fixed at the screw bolts of the movable auxiliary ruler which can slid on the main ruler, and an angle scale is arranged at the rotating shaft point which is used for connecting the main ruler and the rotary auxiliary ruler. The main ruler and the auxiliary rulers can be used respectively as a straightedge, and the functions for the demonstration of the triangular plate, the protractor, the neighboring and complementary angle and the three edges of the triangle and for the demonstration of various special triangles can be realized by moving the auxiliary rulers. The geometry demonstration device can be put vertically on the drawing surface and can be used as the compasses by provided with a chalk.

Description

The multipurpose geometric demonstrator

Technical field

The utility model relates to a kind of writing or drawing appliance, is specifically related to a kind of multipurpose geometric demonstrator.

Background technology

How much known classroom teaching aids have ruler, set square, protractor, compasses and some other how much demonstrators.In teaching practice, because the teaching aid kind that classroom instruction need be carried is many, so that transposing use trouble, and be difficult to carry one by one, bring many inconvenience for the teaching of how much classes and practice.Therefore, this presses for many, easy to use, simple in structure, the portative multipurpose geometric demonstrators of a kind of purposes.

Summary of the invention

The utility model has overcome the function singleness of existing how much demonstrators, carries the problem of inconvenience, provides a kind of purposes many, easy to use, simple in structure, portative multipurpose geometric demonstrators.

The multipurpose geometric demonstrator of this utility model, comprise main scale, the revolute chi, movable secondary chi is formed, this multipurpose geometric demonstrator has the main scale slideway on main scale, revolute chi slideway is arranged on the revolute chi, revolute chi and movable secondary chi equal in length, main scale and revolute chi are by bolted splice, respectively there is a bolt at movable secondary chi two ends, bolt penetrates in main scale slideway and the revolute chi slideway, constitute the cross shaped head slide construction, main scale one end is opened a hole and is fixed chalk folder tube, pass through bolt one compass foot between movable secondary chi and the main scale slideway, and on the main scale slideway, slide main scale and revolute chi with secondary chi one end of activity, on the movable secondary chi length scale is arranged all, angle index is arranged at main scale and joining rotating shaft place of revolute chi.

Because can making ruler respectively, the common main scale of the present invention and secondary chi use, can be movable and folding by main scale and secondary chi, and realize set square, protractor and adjacent supplementary angle, collude the function of burst string demonstration and the demonstration of various special triangle by the moving sets chi.It is stood on drawing surface can do the compasses use, carry, greatly facilitate teacher's teaching with very easy to use.

Description of drawings

Fig. 1 is the utility model overall diagram;

Fig. 2 is a protractor detail drawing in the lower left corner among Fig. 1;

Fig. 3 is figure when colluding the demonstration of strand string for the utility model;

Among the figure: 1 main scale, 2 revolute chis, 3 movable secondary chis, 4 main scale slideways, 5 revolute chi slideways, 6 chalks folder tube, 7 compass foots, 8 length scales, 9 angle indexs.

Embodiment

With reference to the accompanying drawings, the utility model can select for use fish bolt nut, chalk folder tube, compass foot to constitute by main scale, revolute chi, movable secondary chi, main scale slideway and revolute chi slideway, bolt, nut, nut.Revolute chi and movable secondary chi equal in length.On main scale and revolute chi, the movable secondary chi length scale limit is arranged all, angle index is arranged at main scale and joining rotating shaft place of revolute chi.Its long chi, revolute chi, movable secondary chi can be used materials processing manufacturings such as plastics, wood, aluminium.Main scale one end is connected by bolt with the revolute chi to be made it to rotate freely, and respectively there is a bolt at movable secondary chi two ends, and bolt penetrates in main scale slideway and the revolute chi slideway, constitutes the cross shaped head slide construction, and function has been a fixation.

During use, main scale and secondary chi can be made ruler respectively and use, main scale and secondary chi can be movable and folding, realize set square, protractor and adjacent supplementary angle, collude the function of burst string demonstration and various special triangle (as isosceles, equilateral, isosceles right triangle) demonstration by the moving sets chi.It is stood on drawing surface, compass foot place fish bolt nut is screwed, loading onto chalk in the chalk folder tube promptly can be as compasses at the blackboard upper drawing circle, because revolute chi and movable secondary chi equal in length, when slideway slided to revolute chi one end, main scale, revolute chi and movable secondary chi formed isosceles triangle with the secondary chi of activity, therefore ∠ C and ∠ B are adjacent supplementary angle, and ∠ B equals ∠ A, and ∠ C is 180-∠ B, and this has just demonstrated the adjacent supplementary angle of tolerance.

Claims

The multipurpose geometric demonstrator, comprise main scale (1), revolute chi (2), movable secondary chi (3) is formed, it is characterized in that main scale slideway (4) is arranged on main scale (1), revolute chi slideway (5) is arranged on the revolute chi (2), revolute chi (2) and movable secondary chi (3) equal in length, main scale (1) and revolute chi (2) are by bolted splice, respectively there is a bolt at movable secondary chi (3) two ends, bolt penetrates in main scale slideway (4) and the revolute chi slideway (5), constitute the cross shaped head slide construction, main scale (1) one end is opened a hole and is fixed chalk folder tube (6), pass through bolt one compass foot (7) between movable secondary chi (3) and the main scale slideway (4), compass foot (7) is gone up at main scale slideway (4) with bolt and is slided, main scale (1) and revolute chi (2), on the movable secondary chi (3) length scale (8) is arranged all, angle index (9) is arranged at main scale and joining rotating shaft place of revolute chi.