CN201456786U

CN201456786U - Line angle dual-purpose teaching plotter

Info

Publication number: CN201456786U
Application number: CN2009201035093U
Authority: CN
Inventors: 陈振朝; 王利芬
Original assignee: 陈振朝
Priority date: 2009-06-27
Filing date: 2009-06-27
Publication date: 2010-05-12
Anticipated expiration: 2019-06-27

Abstract

The utility model discloses a line angle dual-purpose teaching plotter. A semicircular angle gauge (2) is arranged below a blade of a straight scale (1), the circular center of the angle gauge (2) is arranged on the blade of the straight scale (1), a suspended type pointer (4) is arranged by taking the circular center as a rotating axis (3), and a pointing tip of the pointer (4) points at scales of the angle gauge. In the utility model, the axis of the circular center of the angle gauge is provided with the suspended type pointer, when in use, whether the straight scale is placed on a blackboard surface or other vertical planes, the pointer always points downwards; and according to the reading on the pointer and a dial scale of the angle gauge, geometrical straight lines with various gradients can be conveniently worked out, and the gradients of sloping lines or sloping planes can be conveniently measured. The line angle dual-purpose teaching plotter combines the structure of a conventional straight scale with that of the angle gauge organically, thus realizing multiple purposes by one scale, reducing the number of teaching tools carried by teachers, greatly improving classroom efficiency when the plotter is used for plotting, and having convenient, fast and accurate plotting.

Description

The dual-purpose teaching plotter of line angle

Technical field

The utility model relates to a kind of teaching aid, the dual-purpose teaching plotter of especially a kind of line angle.

Background technology

In mathematics, the physics lesson teaching, often need make a large amount of geometrical line, as the horizontal line that draws, plumb line, become oblique line at any angle with horizontal line (or plumb line), triangle, parallelogram of parallel lines, specified angle etc. apace draw, in physics teaching, draw index path (angle of reflection equals incidence angle, the refraction angle less than or greater than incidence angle etc.), draw the inclined-plane of any gradient etc.Owing to often need on blackboard or other vertical plane, make these geometrical line, the teacher is when giving lessons, need carry various teaching aids such as ruler, protractor, set square or T-square with oneself. use by turns during the demonstration line, quite trouble operates, not only wasted the time, and the figure of making is also very lack of standardization.

Summary of the invention

The purpose of this utility model is exactly in order to overcome the above problems, and provides a kind of line angle dual-purpose teaching plotter, can make the teacher make various how much straight lines easily on vertical plane, and is easy to use, quick, accurate.

The dual-purpose teaching plotter of the utility model line angle is provided with semicircular protractor below the ruler blade, the center of circle of protractor is located on the ruler blade, is that rotating shaft is provided with the hanging type pointer with this center of circle, and the scale of protractor is pointed in the indication end of pointer.

As a kind of improvement of the present utility model, protractor is made as semi-circular, and pointer is located at the hollow section of the semi-circular inboard of protractor.

As another improvement of the present utility model, protractor scale center is 0 degree, and therefrom the mind-set both sides are incremented to 90 degree respectively.

As another kind of improvement the of the present utility model, protractor scale center is 90 degree, and therefrom the mind-set both sides are decremented to 0 degree respectively.

The utility model is established a hanging type pointer at the circle core shaft place of protractor, no matter how ruler is placed on blackboard panel or other vertical plane during use, the sensing of pointer is downward all the time, just can make how much straight lines of required various gradients so easily on blackboard or other vertical face according to the reading on pointer and the protractor dial.Conversely, also available this plotter is measured the gradient on oblique line or inclined-plane intuitively.

The utility model organically combines the ruler structure and the angle gage structure of routine, both can make ruler, can do protractor again, realized that a chi uses more, reduced the quantity that the teacher carries teaching aid, improved classroom efficiency greatly with its mapping, it is convenient, fast, accurate to draw.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

The specific embodiment

As shown in Figure 1, the dual-purpose teaching plotter of the utility model line angle, blade is a ruler 1 and a semicircular protractor 2 that is connected as a single entity, the blade of ruler 1 be one by wood lath or other material such as plastics, the straight batten that bamboo clappers or metallic plate etc. are made, upper limb at batten indicates graduation mark. below ruler 1 blade, be connected with semicircular protractor 2, protractor 2 outer edge sides indicate graduation mark, the center of circle of protractor is located on ruler 1 blade, at this circle centre position one rotating shaft 3 is housed, the company of suspension adorns hanging type pointer 4 in the rotating shaft 3, pointer 4 can 3 rotate around the shaft flexibly, the scale of protractor 2 is pointed in the indication end of pointer 4. and protractor 2 scale centers are 0 degree, therefrom the mind-set both sides increase to 90 degree respectively. when ruler 1 blade is in the level position, pointer 4 points to the groove places of protractor 2 upper angle values for " O " just. when ruler 1 blade when both sides tilt, all can directly read drawn straight line and horizontal angle from protractor 2. in addition, also can mark a circle scale value simultaneously again, the scale center is 90 degree, therefrom the mind-set both sides are decremented to 0 degree respectively, so just can read the angle of drawn straight line and plumb line simultaneously. in addition, protractor can be made the semi-circular of hollow, semi-circular position mark graduation mark, the hollow area 5 of semi-circular inboard freely swings back and forth for pointer, reduce pointer and touch blade, guarantee the sensitivity of its use.

In the practical application, the utility model can be used to draw the various forms of straight lines of system easily on blackboard or other vertical plane, also can be used to measure simultaneously the gradient of object surface in the multiple field of routine work and life, and its concrete occupation mode is as described below:

1, draw straight line: make the plotter back side be close to blackboard, left rotation and right rotation, simultaneously, watch the scale value on the pointer 4 indication protractors 2 attentively, after the indication indicating value reaches desired value, pin this instrument on the other hand, along the setting-out of ruler edge, another hand can draw an oblique line that the angle of inclination is a desired value with chalk; Be horizontal line along the drawn straight line in ruler edge when pointer 4 points to 0 degree value, drawn straight line was a plumb line when pointer 4 pointed to 90 degree values; The many lines that the angle of inclination is identical that draw respectively, then these lines are one group of parallel lines.

2, drawing angle is the angle of α: earlier with the plotter initial line that draws arbitrarily, write down its angle beta corresponding on protractor, then blade is rotated along the plate face, when making pointer indication angle value equal alpha+beta, draw a line again and link to each other with initial line, then the angle formed of these two lines is exactly the appointment angle α that will draw.

3, draw number axis: the method with above-mentioned 1, draw respectively horizontal line and plumb line are put on initial point, unit is number axis accurately.

4, draw other figures: with someway above-mentioned, or the combination of several method, the multiple figure of also can painting out.As: the triangle of specified angle, similar figures, congruent figures, parallelogram, rectangle, index path or the like.

5, the number of degrees of measured angular: make the ruler edge aim at two limits of angle to be measured, read corresponding angle value respectively, the difference of two angle values is measured angle.

In addition, can also mix some annexes, be used for measuring surface slope etc.

Claims

1. dual-purpose teaching plotter of line angle, it is characterized in that: the below at ruler (1) blade is provided with semicircular protractor (2), the center of circle of protractor (2) is located on ruler (1) blade, with this center of circle is that rotating shaft (3) is provided with hanging type pointer (4), and the scale of protractor is pointed in the indication end of pointer (4).

2. the dual-purpose teaching plotter of line angle according to claim 1 is characterized in that: described protractor (2) is made as semi-circular, and pointer (4) is located at the hollow section (5) of the semi-circular inboard of protractor (2).

3. the dual-purpose teaching plotter of line angle according to claim 1 is characterized in that: described protractor (2) scale center is 0 degree, and therefrom the mind-set both sides are incremented to 90 degree respectively.

4. the dual-purpose teaching plotter of line angle according to claim 1 is characterized in that: described protractor (2) scale center is 90 degree, and therefrom the mind-set both sides are decremented to 0 degree respectively.