Portable four-degree-of-freedom teaching compass

Abstract

The invention discloses a portable four-degree-of-freedom teaching compass. The portable four-degree-of-freedom teaching compass comprises a main body support device, a telescopic device and a pen clamping device, which are sequentially connected, wherein the main body support device is a base of the whole compass, and can be conveniently fixed on a blackboard or a whiteboard; the telescopic device comprises a fixed outer rod and a telescopic inner rod; the fixed outer rod is fixedly connected with the main body support device, and the telescopic inner rod is fixedly connected with the pen clamping device, and is arranged in the fixed outer rod, and can move to and fro along the interior of the fixed outer rod, thereby adjusting the distance between a pen and the main body support device, namely adjusting the radius of a drawn circle. The portable four-degree-of-freedom teaching compass is based on an ergonomic design and a multi-body kinematics principle, and has the advantages of simplicity and convenience in operation, high mechanical performance, high circle drawing accuracy and efficiency and the like.

Description

technical field [0001] The invention relates to a tool for teaching drawing, in particular to a portable four-degree-of-freedom teaching compasses. Background technique [0002] The existing teaching compasses are mainly divided into two categories: one is the traditional two-legged teaching compasses; the other is the non-traditional teaching compasses. The upper end of the traditional two-legged teaching compass is hinged, and the lower end can be separated or closed at will to adjust the radius of the arc drawn. When drawing a circle, make the compass foot with the needle point touch the blackboard, and turn the other compass foot with the paintbrush to draw a circle. Although the traditional two-legged compasses are cheap to manufacture, the traditional two-legged teaching compasses still have the following disadvantages: [0003] 1. Poor operability: two hands need to perform several intermittent operations at the same time to draw a complete circle; [0004] 2. The ...

AI Technical Summary

Problems solved by technology

[0003] 1. Poor operability: two hands need to perform several intermittent operations at the same time to draw a complete circle;

[0004] 2. The accuracy is poor: when drawing a circle, the two feet tend to rotate relative to each other, which makes the radius of the circle deviate;

[0005] 3. Poor portability: large size and inconvenient to carry;

[0006] 4. High space occupancy rate: when drawing with a two-legged teaching compass, it is usually operated on the surface of the blackboard, which easily occupies the standing space of the drawer, which is not ergonomic

[0008] 1. The mechanical properties are poor: due to the long arm of static sliding friction between the blackboard and the paintbrush in the process of drawing a circle, a large axial thrust is required to convert the translation of the pushing device into that of the compass rotating arm through screw fit turn to draw a circle;

[0009] 2. The efficiency of drawing circles is low: after drawing a circle, the pushing device needs to be reset to draw the next circle;

[0010] 3. Poor portability: the cross arm cannot be stretched, the size is large, and it is inconvenient to carry;

[0011] 4. High space occupancy rate: When using this non-traditional teaching compasses to draw, the driving device is usually operated on the surface of the blackboard, which will also occupy the standing space of the drawer

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