CN2558532Y

CN2558532Y - Angle protractor and angle protracting device

Info

Publication number: CN2558532Y
Application number: CN 02203176
Authority: CN
Inventors: 刘嘉训
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-02-07
Filing date: 2002-02-07
Publication date: 2003-07-02
Anticipated expiration: 2012-02-07

Abstract

Disclosed is a protractor & angle indicator, a stationery used in teaching or drawing. According to the principle that with the top of the angle with a know degree as the top, with the side of the angle as the side, an angle having the same degree with the angle can be measured or drawn, a circle is evenly divided into 360 parts with the angle for each part is 1 degree, totaling at 360 degrees. A fan of moderate size taken out from the circle can be used as the protractor & angle indicator: the center of the circle is the center of the protractor & angle indicator, two radiuses of the fan can be the starting and ending degree number of the protractor & angle indicator. The device can not only be used to measure angles, but can draw angles of required degree.

Description

The angulation angle drawing device

Affiliated technical field

The utility model relates to a kind of stationery, specifically relates to a kind of not only direct angulation, and can directly draw the angulation angle drawing device at angle.

Background technology

The protractor of being said in present commercially available protractor and existing " the 8th of nine-year compulsory education primary school textbook mathematics " " tolerance at angle " is the background technology of angulation angle drawing device.This protractor is that semicircle is divided into 180 equal portions, each part right angle be 1 ° angle, totally 180 °.This protractor is not the fan type.Because it has increased with 180 ° of fan-shaped diameters is one side, the area of the parallel two ends of another side intersection point on circle with diameter.So more convenient, but can not directly draw the angle with it with this protractor angulation.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of angulation angle drawing device, and it not only can directly measure the number of degrees at angle, and the angle that can directly draw the required number of degrees.By practice as can be known, be the summit with the summit at the angle of known number of degrees, with its two angle identical that can measure or draw while being with this angle number.This is the basic principle of angulation angle drawing device.

According to above-mentioned principle, the technical scheme that its technical problem that solves the utility model adopts is: a circle is divided into 360 parts, every part right angle be 1 °, totally 360 °, it is fan-shaped to take off of size appropriateness from circle, 0 ° of line of the clockwise or counterclockwise both direction when being angulation or picture angle with fan-shaped both sides respectively, and indicate with 1 ° of graduation mark as the expression angle of angular measure unit at scalloped surface, on corresponding graduation mark, mark the numeral of expression angle simultaneously according to certain rules, as 0,270,10,260 ... 260,10,270,0.This is fan-shaped can to become the angulation angle drawing device, and the center of circle is the center of angulation angle drawing device.

In the time of angulation, the summit of the center of angulation angle drawing device and institute's angulation is overlapped, the one side at 0 ° of line and angle overlaps, the another side at angle the number of degrees on the right angulation angle drawing device be the number of degrees of institute's angulation.

When drawing the angle, center from the angulation angle drawing device, do the initial line at angle along ray of 0 ° of line drawing, the center of angulation angle drawing device is overlapped with the end points of initial line, on the angulation angle drawing device, find out the scale of the number of degrees that will draw the angle, this scale is overlapped with the initial line at angle, draw the whole limit of a ray again as the angle along 0 ° of line.

The beneficial effects of the utility model are, use this utility model, by can both directly measuring clockwise or counterclockwise or the angle of the required number of degrees that draw; Arbitrary triangle or arbitrary polygon can draw; Undersized angulation angle drawing device can or be drawn and use for student's study, and large-sized upper handle that adds can use for teaching.

Description of drawings:

Fig. 1 is the front view of 270 ° of fan-shaped angulation angle drawing devices;

Fig. 2 is the left view of 270 ° of fan-shaped angulation angle drawing devices;

Fig. 3 is the front view of 180 ° of fan-shaped angulation angle drawing devices;

Fig. 4 is the left view of 180 ° of fan-shaped angulation angle drawing devices.

Among the figure: 1. the central point of angulation angle drawing device, 2. clockwise 0 ° of line, 3. counterclockwise 0 ° of line, 4. number of division, 5. handle.

The specific embodiment

The first kind embodiment of Fig. 1 shown in being.It is 270 ° fan-shaped.From clockwise 0 ° of line (2) to counterclockwise 0 ° of line (3) or to indicate with 1 ° from counterclockwise 0 ° of line (3) to clockwise 0 ° of line (2) be the graduation mark of the measurement unit of angle, simultaneously, be marked with the numeral 0,270 of expression scale at corresponding graduation mark since 0 ° of line, 10,260 ... 10,260,0,270, this numeral matches with the graduation mark of not marking the angle numeral, measuring angle during in order to angulation or picture angle.Clockwise 0 ° of line (2) and counterclockwise 0 ° of line (3) meet at the central point (1) of angulation angle drawing device.This routine structure is aimed at easily in angulation or when drawing the angle or the summit at definite angle, and can or draw the angle from clockwise 0 ° of line (2) or counterclockwise 0 ° of line (3) both direction angulation, and the right angle more can directly draw.

The second kind embodiment of Fig. 3 shown in being.It is 180 ° fan-shaped.The central point of this routine angulation angle drawing device (1), clockwise 0 ° of line (2) and counterclockwise 0 ° of line (3) coexist on the round diameter.From clockwise 0 ° of line (2) to counterclockwise 0 ° (3) or to indicate with 1 ° from counterclockwise 0 ° of line (3) to clockwise 0 ° (2) be the graduation mark of the measurement unit of angle, be marked with the numeral 0,180 of expression scale simultaneously at corresponding scale since 0 ° of line, 10,170 ... 10,170,180,0, this numeral matches with the graduation mark of not marking the angle numeral, measuring angle during in order to angulation or picture angle.

Above-mentioned two examples all can be made into the small size angulation angle drawing device that is fit to student's study or drawing usefulness.

Fig. 2 and shown in Figure 4 be for Fig. 1 angulation angle drawing device shown in Figure 3 adds upper handle, make large-size and use for teaching.

Claims

1, a kind of angulation angle drawing device, be divided into 180 ° with 1 ° of measurement unit by one as the angle, be carved with the graduation mark that to represent angle from clockwise or counterclockwise both direction on the surface, and the semicircle that is marked with expression angle numeral at corresponding graduation mark with this semicircle diameter serve as another side and two ends an area composition on circle parallel on one side with diameter, it is characterized in that: a circle is divided into 360 °, take off the suitable number of degrees and be carved with from this circle with 1 ° of measurement unit as angle, indicate the graduation mark that can represent angle from clockwise or counterclockwise both direction on its surface, of marking expression angle numeral simultaneously according to certain rules on corresponding scale is fan-shaped.

2, angulation angle drawing device according to claim 1, it is characterized in that: one 270 ° fan-shaped, have on this fan-shaped surface with fan-shaped clockwise 0 ° of line or 0 ° of counterclockwise line be benchmark, with 1 ° of unit as measuring angle, can represent the graduation mark of angle from clockwise or counterclockwise both direction, and be marked with 0,270 at corresponding graduation mark, 10,260,20,250 ... 270, the numeral of 0 expression angle.

3, angulation angle drawing device according to claim 1, it is characterized in that: one 180 ° fan-shaped, have on this fan-shaped surface with fan-shaped clockwise 0 ° of line or 0 ° of counterclockwise line be benchmark, with 1 ° of unit as measuring angle, can represent the graduation mark of angle from clockwise or counterclockwise both direction, and be marked with 0,180 at corresponding graduation mark, 10,170,20,160 ... 180, the numeral of 0 expression angle.

4, angulation angle drawing device according to claim 1 is characterized in that: increase a handle in the appropriate location on angulation angle drawing device surface.