CN86207599U

CN86207599U - Drawing angle square

Info

Publication number: CN86207599U
Application number: CN 86207599
Authority: CN
Inventors: 吴全盈
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-10-09
Filing date: 1986-10-09
Publication date: 1987-07-01

Abstract

The utility model discloses a drawing angle square, in particular to a teaching tool for drawing. The drawing angle square combines each function of compasses, protractors and straight rulers on an integral body, and overcomes the defect that the existing drawing tool has inconvenience for carryover and drawing. The utility model has the advantages of easy fabrication, convenient operation and a plurality of functions.

Description

Drawing angle square

A kind of usefulness of drawing, instrument---the Drawing angle square of the drawing usefulness of particularly imparting knowledge to students.

Original drawing instrument, compasses, protractor, ruler respectively are integral, and it is all inconvenient to carry, map.

The purpose of this utility model is to provide a kind of compasses, protractor, each function of ruler of integrating, the drawing instrument that is easy to carry, maps.

Accompanying drawing of the present utility model is as follows:

Fig. 1 is the structural representation of Drawing angle square.

Fig. 2 is the structural representation of the utility model most preferred embodiment.

As shown in Figure 1, the technical solution of the utility model is to utilize the character of some figures in the plane geometry, and the pin OB that describes of compasses is connected with the two-end-point of folding rule at C, D point respectively with fixing feet OA, forms a rhombus.2 positions of C, D make OC≤1/2 OB, OD≤1/2 OA.C, D point is movably hinged as O, E point.

The pin OB that describes of compasses is marked with the length scale, and both sides CE, the DE of folding rule are marked with angle index.When compasses described that angle is 90 ° between pin OB and the fixing feet OA, Drawing angle square just can be used as protractor and uses.

In the utility model most preferred embodiment as shown in Figure 2, can add one on the Drawing angle square and be parallel to compasses fixing feet OA and be positioned at OA and the horizontal stripe GF in CE centre position, also can add one simultaneously and be parallel to compasses and describe pin OB and be positioned at OG and the horizontal stripe HJ in DF centre position.So that amplify, dwindle figure, draw parallel lines and the usefulness of solid figure.

Near the O place, put on several angle indexs commonly used such as 30 °, 45 °, 60 ° at compasses fixing feet OA, just can know the angle between OA and the OB easily.

The utlity model has easy to use, the advantage that function is many. Except amount length, angle or picture circle, also can look for the mid point of line segment, be the mid point of line segment AB such as E; Looking for the perpendicular bisector of line segment, is the perpendicular bisector of OE such as CD; Making bisector of angle, is the bisector of ∠ AOB such as OE; Directly draw square, rectangle, parallelogram, rhombus; Can draw easily the figures such as isosceles triangle, the square of horizontal positioned and circle and square, cuboid, cylinder.

Claims

1, a kind of usefulness of drawing, instrument--the Drawing angle square of the drawing usefulness of particularly imparting knowledge to students is made up of compasses and a folding rule, it is characterized in that: the pin OB that describes of compasses is connected with the two-end-point of folding rule at C, D point respectively with fixing feet OA, forms a rhombus.

2, Drawing angle square as claimed in claim 1 is characterized in that: compasses are described pin OB and are marked with the length scale, and both sides CE, the DE of folding rule are marked with angle index.

3, Drawing angle square as claimed in claim 1 or 2 is characterized in that: have one to be parallel to compasses fixing feet OA and to be positioned at OA and the horizontal stripe GF in CE centre position on the Drawing angle square, be equipped with one in OG, DF interposition and be parallel to the horizontal stripe HJ that compasses are described pin OB.