CN2380403Y - Multipurpose compass - Google Patents

Abstract

The utility model relates to a pair of multipurpose compasses, which is a drawing instrument gathering a plurality of drawing tools at an integral body and belongs to a teaching appliance. Two legs of the multipurpose compasses are carved with scales and respectively provided with two protractors of 90 DEG, and a horizontal angle indicator is also arranged on a fixing leg. The utility model has comprehensive functions of a plurality of appliances such as a pair of compasses, a protractor, a set square, a straightedge, a measuring scale, a level instrument, etc. The disadvantage that a plurality of appliances are needed by the original drawing is solved. The utility model has the advantages of convenient carryover, flexible operation and easy control and is suitable for drawing a straight line, a triangle, a circle, a proportional figure, a polygon, a parallel, a vertical line, etc. A horizontal plane and verticality can also be measured.

Description

The multipurpose compasses

The utility model belongs to teaching aid.

At present, the compasses that people use and other drawing instruments, generally all purposes is single.Draw the figure of a complexity, need multiple apparatus such as compasses, set square, protractor, ruler, carry and operate all inconvenient.

Now, though this similar invention is arranged, their scope of application is little, operates dumbly, also need join other apparatus during drawing, and complex process is difficult for making.

The purpose of this utility model is that a kind of improved multipurpose compasses will be provided.Can substitute apparatus such as compasses, set square, protractor, ruler, engineer's scale, horizontal vertical instrument with it, and can independently draw easily: multiple figures such as triangle, parallel lines, vertical line, circle, can also amplify and dwindle figure.

This multipurpose compasses, according to the purpose difference of its use, it is also different to make material and specification, but sized is not made teachers ' teaching and is drawn with, student with, engineering mapping and use etc.Concrete structure is shown in Fig. 1 (direct-view figure).Be carved with the scale of expression length on the two legs inner edge of these compasses respectively, the middle and upper part of two legs is connecting two 90 ° protractor, 3 and 4 respectively.Wherein, what decide on the leg 1 to connect is to be carved with 0 °～90 ° protractor to be marked on for 4,0 ° and to decide A place on the leg inner edge, and 90 ° are the B place.What connect on the moving leg 2 is to be carved with 180 °～90 ° protractor to be the C place for 3,180 °.90 ° are marked on D place (Fig. 2) on the moving leg inner edge.0 °～90 ° protractor in the above, when measuring the right angle, two protractors just in time overlap; When measuring the straight angle, two protractors are just in time formed one 180 ° protractor.The intersection point of two inner edges overlaps with protractor centre point " 0 " 6, and " 0 " point is tubular rivet.Decide inboard leg and adorn a level angle indicator 8.

In example shown in Figure 1, the two legs of multipurpose compasses is decided leg (1) and moving leg (2), and their tie point is (6), is carved with the scale of expression length on the positive limit of two legs respectively, and 0 scale is from (6).The middle and upper part of deciding leg (1) is connecting the protractor (4) that is carved with 0 °～90 °, and on moving leg (2), the A place is 0 ° of graticule, and the B place is 90 ° of graticules.The middle and upper part of moving leg (2) is connecting the protractor (3) that is carved with 180 °～90 °, and below deciding leg (1), the C place is 180 ° of graticules, and among Fig. 2, the D place is 90 ° of graticules, (7) locate with the D place at grade.When the angle of measuring 0 °～90 °, the inner edge of decide leg (1) and moving leg (2) overlaps with the both sides of measured angle respectively, reading on protractor (4), and (7) are the reading mark.

In another example shown in Figure 2, the tie point of deciding leg (1) and moving leg (2) is (6), and decides leg (1) inboard and adorn a level angle indicator (8), in order to measure the horizontal plane of object.The middle and upper part of deciding leg (1) is connecting 0 °～90 ° protractor (4), and the A place is 0 ° of graticule, and the B place is 90 ° of graticules.The middle and upper part of moving leg (2) is connecting 180 °～90 ° protractor (3), and the C place is 180 ° of graticules, and the D place is 90 ° of graticules, and protractor (4) is on protractor (3).The inner edge (7) of moving leg (2) is the reading mark at 0 °～90 ° of angles.When measuring 90 °～180 ° angles, two inner edges of the two legs of multipurpose compasses overlap with the both sides of measured angle respectively, have device (3) to go up reading in amount, and B is the reading mark.

When on engineering or plane, drawing, as long as open the two legs of compasses, just can obtain length from 0 °～180 ° any angle and two limits.The triangle of the known angle of once can drawing and two length of sides.Wherein, 0 °～90 ° angle is to be the reading mark with 7 on moving leg 2 inner edges.When measuring or drawing 90 °～180 ° any angles, shown in Fig. 2 (stereogram).When tested angulation is 120 ° of readings, be the reading mark just with 90 ° of groove B that decide on the leg, allow the scale on the moving leg protractor below it just in time overlap for 120 ° with B, then this moment, the angle that protractor is surveyed is 120 °, 90 °～180 ° are all like this with interior angle.Simultaneously, utilize the level angle indicator, can draw parallel lines, vertical line, and can be used to measure the horizontal plane and the perpendicularity of building, also can draw ratio figure etc.

The utility model is easy to use, and it has overcome the shortcoming that existing compasses exist, and can reach separately behaviour Do; Have simultaneously the apparatus such as compasses, protractor, set square, ruler, horizontal vertical instrument, engineer's scale Multiple use.

Claims (3)

1, a kind of multipurpose compasses, interconnect and form by two legs, two arms, it is characterized in that: on the two legs of multipurpose compasses, connecting two 90 ° protractor respectively, be carved with the scale of expression length on the positive limit of two legs respectively, and decide inboard leg a level angle indicator is housed.

2, multipurpose compasses according to claim 1, it is characterized in that: the scale that is carved with expression length on the positive limit of the two legs of multipurpose compasses respectively, 0 scale overlaps with the tie point of two legs, the middle and upper part of two legs is connecting two 90 ° protractor respectively, and with decide protractor that leg is connected with above the protractor that moving leg is connected.

3, must ask 1 described multipurpose compasses according to power, it is characterized in that: a level angle indicator is equipped with in the inboard of deciding leg.

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