CN103640370A - Multipurpose chalk - Google Patents

Abstract

The invention discloses multipurpose chalk which comprises a chalk column (1), wherein two ends of the chalk column (1) adopt round planes, and the chalk column (1) is arch-shaped. Two ends of the chalk column (1) can be contacted with a blackboard (2) simultaneously and can draw two parallel lines once, or one end is taken as a fixed point, and the other end is taken as a moving point for drawing a circular arc, except that one end of the chalk column (1) is used for writing or drawing a single line just like conventional chalk. A user can hold a plurality of pieces of chalk, so that a plurality of parallel lines can be drawn once, the structure is as simple as the conventional chalk, and the chalk is as easy to manufacture as the conventional chalk.

Description

Multipurpose chalk

Technical field

The invention belongs to chalk, more specifically to a kind of Multipurpose chalk.

Background technology

Existing cylindric chalk, vertical section is trapezoidal or rectangle, once can only paint a line, and can not draw circular arc, in teaching process, often must on blackboard, with chalk, paint many parallel lines, sometimes must draw schematic circular arc, for increasing work efficiency, provide a kind of and can once paint many parallel lines, and the Multipurpose chalk that can draw schematic circular arc, tool is of great significance.

Summary of the invention

The object of this invention is to provide a kind of Multipurpose chalk.

A kind of Multipurpose chalk of the present invention, comprises that two ends are the chalk post of disk, and described chalk post is arc.

The present invention has following beneficial effect compared with prior art:

Because described chalk post is arc, therefore, except carrying out write identical with existing chalk with wherein one end of chalk post, or outside picture single line, can allow the two ends of described chalk post contact with blackboard surface simultaneously, once paint two parallel lines, or to take wherein one end be fixed point, the other end is moving strokes and dots circular arc.Also hand-holdable several chalk of the present invention, once paints more parallel lines, and its structure is simple, manufacture easily suitable with existing chalk.

Accompanying drawing explanation

Fig. 1 is the perspective view of chalk of the present invention.

Fig. 2 is painted the result of use schematic diagram of two parallel lines by chalk of the present invention.

Fig. 3 is the result of use schematic diagram by drawing with coloured chalk circular arc of the present invention.

Fig. 4 combines by two chalks of the present invention the result of use schematic diagram of painting four parallel lines.

Fig. 5 is the side direction result of use schematic diagram of Fig. 4.

The specific embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

Shown in Fig. 1, a kind of Multipurpose chalk of the present invention, comprises that two ends are the chalk post 1 of disk, and described chalk post 1 is arc.Its any one end all can be write, or draws single line.

Allow the two ends of described chalk post 1 contact with blackboard surface 2 simultaneously translation afterwards it, once can draw two parallel lines, as shown in Figure 2.

Take chalk of the present invention wherein one end be fixed point, the other end can draw schematic circular arc for moving point, as shown in Figure 3.

Hand-held several chalk of the present invention, once can draw more parallel lines, and hand is held two described chalk posts 1 simultaneously, once can draw four parallel lines, as shown in Fig. 4 or Fig. 5.

Claims (1)

1. a Multipurpose chalk, comprises that two ends are the chalk post (1) of disk, it is characterized in that, described chalk post (1) is arc.

Images