CN202753656U

CN202753656U - Compass for teaching

Info

Publication number: CN202753656U
Application number: CN 201220462649
Authority: CN
Inventors: 高建芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-03
Filing date: 2012-09-03
Publication date: 2013-02-27
Anticipated expiration: 2022-09-03

Abstract

A compass for teaching is disclosed. The compass for the teaching comprises two branch arms (3) and a connecting shaft (7), wherein a fixing point (1) is arranged on the top end of one of the branch arms (3), a chalk sleeve (2) is arranged on the top end of the other branch arm (3), a protractor (8) is further arranged on the top end of the connecting shaft (7), a set square (5) is arranged at the outer side of each of the branch arms (3) in a connected mode, a horizontal bead and a dividing ruler are arranged at the out side of each of the branch arms (3). The compass for the teaching is capable of enabling teachers to draw circles concisely and rapidly on a blackboard, besides a horizontal line can be found rapidly, and refine operations like arc drawing are better facilitated. The compass for the teaching is various in function and capable of enabling the teachers to operate and draw the circle, a straight line, an arc, a right angle, an acute angle, measure angle and the like diversely and rapidly.

Description

A kind of compasses for teaching

Technical field

The utility model relates to a kind of technical field of teaching apparatus for mathematics, is specifically related to a kind of compasses for teaching.

Background technology

The compasses of prior art are Double-arm compass, as a kind of specific purpose tool of drawing circle or circular arc, a wherein arm of Double-arm compass is stiff end, the central point of drawn circle or circular arc namely, be provided with writing implement on another arm, the track that is used for circle or circular arc, distance between two arms is the radius of circle or circular arc, this size need to be measured by ruler, and usually need to take ruler or rule to be used in the actual use procedure, in addition when blackboard is drawn circle or is drawn straight line, if the straight line of drawing at the beginning is not level, the figure of back is when continuing to draw a picture, and is often convenient not.

China Patent Publication No. is CN201376426, the utility model specification that open day is on January 6th, 2010 discloses a kind of " single-arm compass ", this utility model comprises scale arm, slip pen clip, lettering pen and fixation kit, be equipped with the slip pen clip on the scale arm, be provided with lettering pen on the slip pen clip, lettering pen is chalk or pencil, a wherein end of scale arm is movably arranged on the fixation kit, the stiff end of fixation kit is stylus structure or sucked type structure, the other end at the scale arm is provided with the handle fixed mount, is provided with control handle on the handle fixed mount.During use, the first position of mobile slip pen clip on the scale arm, thus determine the radius of drawn circle or circular arc, then with the fixing point of determining on the other hand fixation kit, another holds control handle, draws circle or circular arc centered by the fixing point of fixation kit.The single-arm compass of this utility model compared with prior art has the characteristics such as reasonable in design, simple in structure, easy to use, owing to be provided with scale on the scale arm, can just can be easy to determine by ruler the radius size of circle or circular arc.But this utility model global design is too complicated, and use procedure is more loaded down with trivial details, carries inconvenience, does not reach due brief effect, on the contrary in use inconvenience everywhere.

The utility model content

The purpose of this utility model is for prior art deficiency in use, and a kind of simple in structure, easy to operate, result of use is good, function is many compasses for teaching is provided.

The purpose of this utility model realizes by following technological means: a kind of compasses for teaching, include two support arms, connecting axle, the top of one of them support arm is provided with fixing point, and the top of another support arm is provided with chalk sleeve, and the top of described connecting axle also is provided with protractor; The outside of described any support arm also is connected with set square.

The outside of described any support arm also is provided with rule.

The outside of described any support arm also is provided with horizontal bead.

Compared with prior art the utlity model has following obvious advantage: this compasses for teaching can succinctly carry out the picture circle at blackboard fast, and, can find fast horizontal line, more be conducive to the refinements such as picture arc; This compasses for teaching diverse in function can easily be drawn circle, draws straight line, camber line, picture right angle, acute angle, be measured that angle etc. is various draws a picture fast.

Description of drawings

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

Among the figure, the fixing point of 1-, 2-chalk sleeve, 3-support arm, 4-rule, 5-set square, 6-horizontal bead, 7-connecting axle, 8-protractor.

The specific embodiment

Below in conjunction with description of drawings and the specific embodiment the utility model is described in further detail:

A kind of compasses for teaching as shown in Figure 1 includes two support arms 3, connecting axle 7, and the top of one of them support arm 3 is provided with fixing point 1, and the top of another support arm 3 is provided with chalk sleeve 2, and the top of described connecting axle 7 also is provided with protractor 8; The outside of described any support arm 3 also is connected with set square 5.Arrange like this, when this compasses for teaching can easily carry out the picture circle, also can easily measure angular dimension, and can also carry out the conventional purposes of the set squares 5 such as right angle, acute angle, really accomplish a teaching aid variation operation, greatly simplified the quantity that the teacher carries teaching aid.

The outside of described any support arm 3 also is provided with horizontal bead 6.Arrange like this, this compasses for teaching can find fast horizontal position and draw a picture, and the figure that conveniently more becomes more meticulous is drawn a picture.

The outside of described any support arm 3 also is provided with rule 4.Arrange like this, this compasses for teaching can carry out straight line draws a picture, and can also measure the distance that need to draw a picture.

In a word, the utility model provides a kind of simple in structure, easy to operate, result of use is good, function is many compasses for teaching.The above; it only is a part of specific embodiment of the present utility model; protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.

Claims

1. compasses for teaching, include two support arms (3), connecting axle (7), the top of one of them support arm (3) is provided with fixing point (1), the top of another support arm (3) is provided with chalk sleeve (2), it is characterized in that: the top of described connecting axle (7) also is provided with protractor (8); The outside of described any support arm (3) also is connected with set square (5).

2. a kind of compasses for teaching according to claim 1, it is characterized in that: the outside of described any support arm (3) also is provided with horizontal bead (6).

3. a kind of compasses for teaching according to claim 1, it is characterized in that: the outside of described any support arm (3) also is provided with rule (4).