CN202507778U

CN202507778U - Three-foot compass

Info

Publication number: CN202507778U
Application number: CN2012200358056U
Authority: CN
Inventors: 王跃霖
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-01-12
Filing date: 2012-01-12
Publication date: 2012-10-31
Anticipated expiration: 2022-01-12

Abstract

The utility model discloses a three-foot compass. Two movable compass feet are randomly connected to a telescopically adjusted fixed foot; a protractor is arranged on the upper half part of the telescopically adjusted fixed foot in the middle of the three-foot compass, so that positions of the two movable compass feet can be measured; and a telescopic adjustment device is arranged at the middle lower end of the telescopically adjusted fixed foot. The compass can draw two concentric circles at the same time or draw one circle by rotating around a half circle and has the characteristics of convenience in operation, time saving and vitality.

Description

A kind of Three point compass

Technical field

The utility model relates to a kind of stationery, particularly a kind of Three point compass.

Background technology

At present, the compasses that people use always are two pin, need a circle could draw a circle, draw a circle if think half-turn, perhaps draw two concentric circles simultaneously, just must draw a whole circle, and perhaps twice completion influences operating efficiency.

The utility model content

The purpose of the utility model just provides a kind of half-turn and draws a circle, or draws two concentrically ringed a kind of stationery simultaneously.

For achieving the above object, this reality has the following technical scheme of novel employing:

One kind of tripod compasses, including fixed legs, feet and protractor regulatory activity, characterized in that: the compass is set to three feet, the middle of the fixed foot, fixed foot middle setting an adjustable fixed telescopic leg length adjustment device, two fixed foot side of the activities undertaken by two feet, the fixed part is provided with a protractor feet, active regulation of the foot to the top and the upper end of the fixed pin are connected together, and Duo sexual activity, such compass can draw two concentric circles, can be half a turn on the painting on a circle.

Above-mentioned fixing feet is to play the effect of fulcrum, and according to the contact situation of both sides moving gauge foot alive with object, telescopic is regulated.

Above-mentioned both sides moving gauge foot alive plays the effect of picture circle.

Above-mentioned protractor is to play the effect that locates to both sides moving gauge foot alive.

The advantage of the utility model is: establish the skill uniqueness, and simple in structure, easy to operate, can effectively increase work efficiency.

Description of drawings

Figure is a kind of sketch map of Three point compass

Among the figure: 1, fixing feet; 2, the moving gauge foot of living; 3, extension adjustment device; 4, protractor.

The specific embodiment

The figure shows, scalable fixed foot with the lower end of a telescopic adjustment device 3; sides of activities undertaken with retractable feet 2 fixed foot a Duo sexual connection; protractor 4 center with retractable fixed foot a fixed connection .

Draw a bowlder when the user need use the Three point compass half-turn, moving gauge foot is lived separately in both sides, locate with protractor; Make both sides moving gauge foot alive identical with telescopic fixing feet both sides angle; With telescopic fixing feet is fulcrum, and regulates telescopic location, draws semicircle and gets final product.

When the user need draw the concentric circles of two different sizes simultaneously with Three point compass; Moving gauge foot being lived separately in both sides, make telescopic fixing feet and both sides moving gauge foot alive form different angles, is fulcrum with telescopic fixing feet; And regulate telescopic location, draw circle and get final product.

To sum up said, the utility model is a kind of Three point compass, can reach easy to use, but half-turn is drawn a circle, also can draw the concentrically ringed purpose of two different sizes simultaneously.

Claims

1. a Three point compass comprises fixing feet, moving gauge foot alive and protractor, and it is characterized in that: compasses are set to three pin, and the centre is a fixing feet, and the fixing feet both sides are two moving gauge foots alive.

2. according to the described a kind of Three point compass of claim 1, it is characterized in that: the extension adjustment device that a scalable fixing feet length is set in the middle of the fixing feet.

3 according to claim 1, wherein a three-legged compasses, characterized in that: the top of the activities undertaken by the foot pin connected to the upper fixed together, and Duo sexual activity.

4. according to the described a kind of Three point compass of claim 1, it is characterized in that: fixing feet the first half is equipped with a protractor.