CN202319544U

CN202319544U - Teaching compasses

Info

Publication number: CN202319544U
Application number: CN201120456465XU
Authority: CN
Inventors: 曹建强
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2012-07-11
Anticipated expiration: 2021-11-14

Abstract

The utility model discloses teaching compasses. The teaching compasses comprise two support arms (3) and a connecting shaft (7), wherein a fixed tip (1) is arranged on the top of one support arm (3); a chalk sleeve (2) is arranged on the top of the other support arm (3); and a triangle (5) is connected to the outer side of any one support arm (3). A graduated scale (4) is arranged on the outer side of any one support arm (3). A horizontal bead (6) is also arranged on the outer side of any one support arm (3). By using the teaching compasses, a circle can be simply and quickly drawn on a blackboard, a horizontal line can be quickly found, and fine operation such as arc drawing and the like is easily performed; and the teaching compasses have various functions and can be operated to conveniently and quickly draw circles, straight lines, arcs, right angles, acute angles and the like.

Description

A kind of compasses for teaching

Technical field

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

Background technology

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

The Chinese patent publication number is CN201376426; The utility model specification that open day is on January 6th, 2010 discloses a kind of " single armed compasses ", and this utility model comprises scale arm, slip pen clip, lettering pen and fixation kit, is equipped with the slip pen clip on the scale arm; The slip pen clip is provided with lettering pen; Lettering pen is chalk or pencil, and a wherein end of scale arm is movably arranged on the fixation kit, and 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, and the handle fixed mount is provided with control handle.During use, move earlier the position of slip pen clip on the scale arm, thereby confirm the radius of drawn circle or circular arc, with the fixing point of confirming fixation kit on the other hand, another holds control handle then, is that circle or circular arc are drawn in the center with the fixing point of fixation kit.The single armed compasses of this utility model compared with prior art have characteristics such as reasonable in design, simple in structure, easy to use, because the scale arm is provided with scale, so can just can be easy to confirm the radius size of circle or circular arc by ruler.But this utility model global design is too complicated, and use is more loaded down with trivial details, carries inconvenience, does not reach due brief effect, on the contrary inconvenience everywhere in use.

The utility model content

The purpose of the utility model is to 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 the utility model realizes through 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; The top of another support arm is provided with chalk sleeve, and the outside of said any support arm also is connected with set square.

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

The outside of said any support arm also is provided with horizontal pearl.

Compared with prior art the utlity model has following tangible advantage: this compasses for teaching can succinctly carry out the picture circle fast on blackboard, and, can find horizontal line fast, more help the operations that become more meticulous 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 etc. are various draws a picture fast.

Description of drawings

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

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

The specific embodiment

Below in conjunction with the description of drawings and the specific embodiment the utility model is done further to describe in 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 outside of said any support arm 3 also is connected with set square 5.Be provided with like this, when this compasses for teaching can easily carry out the picture circle, also can easily carry out the conventional purposes of set squares 5 such as right angle, acute angle, really accomplish a teaching aid variation operation, simplified the quantity that the teacher carries teaching aid greatly.

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

The outside of said any support arm 3 also is provided with horizontal pearl 6.Be provided with like this, this compasses for teaching can find horizontal position fast and draw a picture, and the figure that conveniently more becomes more meticulous is drawn 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; Be merely a part of specific embodiment of the utility model; The protection domain of the utility model is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the 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), and the top of another support arm (3) is provided with chalk sleeve (2), it is characterized in that: the outside of said any support arm (3) also is connected with set square (5).

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

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