CN2072483U

CN2072483U - Directional sliding set square

Info

Publication number: CN2072483U
Application number: CN 89217396
Authority: CN
Inventors: 毛家华
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-09-30
Filing date: 1989-09-30
Publication date: 1991-03-06

Abstract

The utility model relates to a directional sliding set square, belonging to a teaching aid. The directional sliding set square which can be rolled directionally is suitable for drawing on blackboards with various quality. The directional sliding set square which is provided with a protractor has all the functions of a pair of a set square and a protractor originally. A rolling device is arranged on the set square and can accurately draw parallel lines. The friction between the bottom face of the set square and the blackboard can be avoided, and the line drawn can be guaranteed to be clear. A hollow handle is arranged on the set square, so that newly designed multi-function compasses for teaching can be arranged in the hollow handle. The utility model has the advantages of multifunction, and convenient use and carrying.

Description

Directional sliding set square

The utility model belongs to a kind of teaching aid.

It one is to rely on hand and eyes to grasp that existing set square draws parallel lines, and constructional error is big; The 2nd, rely on compasses to map by method of geometry, draw parallel lines and want several steps, spended time; The 3rd, set square bottom surface and blackboard friction are wiped the figure line of having finished fuzzy easily.

The purpose of this utility model just provides a kind of set square that overcomes above deficiency.

The utility model is achieved in that as shown in Figure 1.1 is set square among the figure, and 2,3 is rotation axis, and 4 is rotating shaft base, and 5 is roller.Rotation axis 2,3 can rotate in rotating shaft base 4, and rotating shaft base 4 is installed on the set square 1.Rotation axis 2,3 drives roller 5.Relevant position at set square upper roller 5 has the hole, and roller can roll on blackboard.

Using method:

When drawing parallel lines, earlier draw a baseline after, draw the line of other and this line parallel again and realize with regard to the slip that relies on roller.Be carved with scale on the roller and can control distance between parallel lines.When needs are made perpendicular line, draw earlier a baseline, utilize protractor on the set square to change 90 ° after, the perpendicular line that can make this line exactly is itself and this corresponding parallel lines of line.Also set square can be changeed the angle that you need, the optional angle line set square that draws is provided with hollow handle 6, the self-designed multifunctional teaching compasses of packing in the hollow handle 6.Make and the utlity model has practicality widely.

Advantage of the present utility model:

Rely on roller devices, can before and after the characteristics of sliding make parallel lines, can reduce the mapping time, improve plotting quality, avoid set square on blackboard, to rub, guarantee to have drawn the clear of line.

Claims

A kind of set square, it is characterized in that by set square 1, rotating shaft 2,3, shaft seat 4, roller 5 and hollow handle 6 are formed, device rotating shaft base 4 on set square, rotation axis 2,3 circular holes from corresponding rotating shaft seat 4 pass, fixing with roller 5, have the hole in the relevant position of set square 1 upper roller 5, roller rolls on blackboard.