CN2294171Y - Multi-purpose compass for teaching - Google Patents

Abstract

The utility model relates to a teaching aid for drawing, which is composed of a right and a right arms, wherein, the lower end of the left arm is fixed with an iron nail foot, and the lower end of the right arm is fixed with a chalk holder. The utility model is characterized in that the outside of the right arm is provided with a ruler, the lower end of the right arm is movably connected with a sliver-shaped middle arm, and the left arm is labeled with angle scales. The multi-purpose compass for teaching which integrates the functions of a compass, a set square, a protractor and a ruler, has the advantages of convenient operation, convenient carryover, legerity, agility, etc., especially suitable for teaching.

Description

Use the canon more

The utility model relates to a kind of teaching aid of describing, and especially Ji Yuan rule, set square, protractor, ruler function in the teaching aid of using of one more.

The teaching aid function singleness of using is taught class hours how much now, and the teacher must carry multiple teaching aids such as garden rule, set square, protractor, ruler, and is pretty troublesome.

The purpose of this utility model provides functions such as a kind of Ji Yuan rule, set square, protractor, ruler in one, uses, the canon of using easy to carry more.

Use the canon described in the utility model more, be made of left arm and right arm, the left arm lower end is fixed with the iron nail pin, the right arm lower end is fixed with the chalk seat, and the left and right arms top flexibly connects, and the right arm arranged outside has the ruler of master scale, the right arm lower end is connected with arm in the strip, and left arm indicates angle index.

Arm is garden rule in closing up during use; Close up middle arm, left arm is ruler; Stretch out left arm, arm can constitute arbitrary triangle in moving, and can make set square and use; Utilize the angle of right arm and middle arm, can measure any angle between 0～80 ° rapidly, the angle of arm and left arm can be measured any angle between 70 °～150 ° rapidly in the utilization, has the function of protractor.

After the utility model adopts such structure, move middle arm and left arm, just can finish the function of garden rule, ruler, set square, protractor, play the effect of one-object-many-purposes, and it is more flexible than traditional fixed triangle plate, suitable, simultaneously, owing to have anti-skidding pulloverly on the iron nail pin of left arm, avoided between iron nail pin and the smooth blackboard frictional force too little, the drawback of the fixed point of easily sliding during use, reach the anti-skidding effect of garden rule, be particularly suitable for the usefulness of teaching demonstration, also can be made into other drawing appliance.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is many stereograms with the canon.

The canon of using shown in Figure 1 adopt timber to make more, are made of left arm 7 and right arm 4, and left arm 7 lower ends are fixed with iron nail pin 8, and right arm 4 lower ends are fixed with chalk seat 3, and left and right arm top flexibly connects with screw rod; Right arm 4 outsides extend to ruler 2, and long measure master scale 1 is arranged on it; Right arm 4 lower ends flexibly connect arm 5 in the strip that indicates measuring angle coincidence district 6, and left arm 7 indicates angle index 10 and measuring angle overlaps district 6; There is a shorter right angle step 11 right arm 4 upper ends, and middle arm 5 its length of gathering and thickness just coincide with right arm step 11 and constitutes cuboids; Rubber anti-skidding pullover 9 is arranged on the left arm iron nail pin.

During use, arm 5 in the gathering, and left arm is fixed point, and right arm is garden, the garden arc of moving any radius that can draw; Middle arm 5, left arm 7 are all closed up, and then are a bar ruler; Left arm 7 is stretched out, and arm 5 in moving can the form right angle triangle, obtuse angle, acute triangle arbitrarily such as isosceles triangle, plays the effect of set square, and the function of protractor is arranged simultaneously.

Angulation using method: earlier left arm 7 is overlapped district 6 with the angulation of middle arm 5 and overlap, screw the pommel screw, fixedly left arm 7, at this moment left arm and right arm angle are set at 30 °, arm 5 and right arm 4 angles make with the institute angulation and overlap in changing again, can read corresponding angle on the left arm of angle index indicating, can obtain with the angle of middle arm and left arm greater than 80 ° of persons.

The utility model also can adopt materials such as plastics, lucite, metal to be made into the canon of using that all size differs more; The change of left arm angle index and left arm and right arm set angle; For the student use or technical staff's drawing with waiting these conversion all to drop within the protection domain of the present utility model.

Claims (4)

1, a kind ofly many use the canon, be made of left arm and right arm, the left arm lower end is fixed with the iron nail pin, and the right arm lower end is fixed with the chalk seat, the flexible connection of left and right arms top, and it is characterized in that: the right arm arranged outside has the ruler of master scale; The right arm lower end is connected with arm in the strip; Left arm indicates angle index.

2, according to claim 1ly many use the canon, it is characterized in that respectively indicating on middle arm, the left arm measuring angle and overlap and distinguish.

3, according to claim 1ly many use the canon, it is characterized in that the right arm upper end have a shorter step, middle arm draw in its length and thickness just with the right arm step formation cuboid that coincide.

4, according to claim 1 use the canon more, it is characterized in that having on the left arm iron nail pin anti-skidding pullover.

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