CN2164364Y - Set square for geometric drawing - Google Patents

Abstract

The utility model relates to a set square for geometric drawing. The utility model uses a right angle set square with scales (11) as a soleplate (1). Telescopic figures (2) are arranged on the soleplate (1), anchor points (20) of the figures of the telescopic figures (2) are perforated, and elliptic curve figures (24) are hollowed. The utility model has the advantage of easy operation. The utility model overcomes the disadvantage that existing drawing plates are impractical because of large area of the soleplate or too small shrunken figures along with the hollow of used figures.

Description

Set square for geometric drawing

The utility model relates to a kind of drafting instrument, specifically, is a kind of how much drawing set squares.

How much draughting boards of student's use at present all are to adopt to dig out multiple figure on transparent panel, for example, and curve ruler.During drawing, pen is being pasted the edge that hollows out figure drawing a week, or getting the edge combination that its general edge and another hollow out figure and be drawn as required figure, its advantage is directly perceived, and drawing rapidly.Yet but there is following shortcoming in this draughting board that hollowing graphics is constituted: 1. figure does not match, and does not go to use it because of impracticable when general student does how much topics; 2. will arrange on a base plate that enough required figures that hollows out of basic mapping have difficulties, promptly it is not that figure too small (being difficult to practicality) is exactly base plate too big (not portable or impracticable).Therefore, when middle school student finish geometric operations, usually must be equipped with compasses, ruler, set square and curve ruler etc., just can finish various geometric making.Obviously the inconvenience that has increased expense and carried.

The purpose of this utility model provides a kind of set square with supporting figure, so that paint out multiple plane geometric figure and solid figure, is particularly suitable for how much class mapping operations in middle school.

Technical solution of the present utility model is: 1. the set square that uses with tradition is substrate; 2. to being that several figures on border are got its location, summit with the straight line, (summit) bored a hole on the base plate relevant position, like this, just can adopt figure intussusception method to overcome the existing defective of draughting board because of hollowing graphics is supervened; 3. for circle, by some perforation location on center of circle perforation and the circumference; For ellipse figure still with the hollowing graphics setting.In sum, the utility model system is a base plate with the set square, lays multiple geometric figure on the appropriate location of this base plate, and they overlap each other, and respectively to graph positioning point perforation and elliptic curve hollowing graphics.

The utility model has the advantages that: improve existing set square structure, be convenient to the student and finish how much drawing, be fit to the how much desired supporting fundamental figures of class in middle school owing on set square, lay, so the user can directly draw by laying figure, or draw by their combination, particularly only use the set square of the present utility model high school student that just can draw to be difficult to the solid geometry figure of picture.

Fig. 1 and Fig. 2 are respectively example structure schematic diagram of the present utility model.

Provide better embodiment of the utility model according to Fig. 1 and Fig. 2, and will further provide ins and outs of the present utility model in conjunction with description to present embodiment.

Present embodiment adopts the right angle triangle of 15 centimetres in a cover as base plate 1, and the set square of this specification is best suited for the drafting instrument that middle school student use.

See also Fig. 1, base plate 1 is the right angle triangle at one 30 °-60 ° of angles, except 60 ° of angles of preserving existing set square have the scale label 11 on the right right-angle side, also be laid with intussusception figure 2, this sheathed figure 2 comprises the circumscribed triangle of solid geometry figure, polygon, circle, triangle and circle, the inscribed polygon of circle etc.Perforation anchor point 20 is arranged on this intussusception figure 2, and its pore size and drawing pen nib are suitable.Have 27 anchor points 20 in the present embodiment, during use, locate, relend and help set square to carry out the straight line connection, or finish the operation of picture circle by two pencils as long as the nib that will chart passes anchor point 20.From scheming as seen, anchor point 20 comprises summit 21, the center of circle 22 and circular path fixed point 23.The aperture of the anchor point 20 in the present embodiment and 0.7 millimeter propelling pencil nib match.

See also Fig. 2, the base plate 1 among the figure is the isosceles right angle triangle of 15 centimetres of specifications, keeps the scale label 11 of existing isosceles right angle triangle on its hypotenuse, is equipped with intussusception figure 2 on base plate 1.This intussusception figure 2 can constitute two cones and a cylindrical body, be characterized in the bottom surface being the hollowing graphics of elliptic curve, and anchor point 20(is summit 21) perforation.

Claims (5)

1, a kind of how much drawing set squares, system is base plate (1) with the right angle triangle that scale label (11) is arranged, it is characterized in that on the appropriate location of this base plate (1), being laid with intussusception figure (2), and upward anchor point (20) perforation and the elliptic curve figure (24) of contained figure hollow out to this intussusception figure (2).

2,, it is characterized in that said the right angle triangle of scale label (11) is arranged is isosceles right angle triangle or 30 ° of-60 ° of right angle triangles according to the described set square of claim 1.

3,, it is characterized in that said sheathed figure (2) comprises the inscribed polygon of solid geometry figure, polygon, circle, triangle and circle and the circumscribed inscribed triangle and the elliptic curve figure (24) of circle according to the described set square of claim 1.

4,, it is characterized in that anchor point (20) comprises summit (21), the center of circle (22), circular path fixed point (23) according to the described triangle of claim 1.

5,, it is characterized in that the size in this hole and drawing pen nib are suitable to anchor point (20) perforation according to the described triangle of claim 1.

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