Two-leg parallel compass with single-leg horizontal stretching and retracting function

Abstract

The invention provides a two-leg parallel compass with a single-leg horizontal stretching and retracting function. The compass comprises a fixed leg, a moving leg, hinge links, hinge shafts, a positioning pin and a brush head, and is characterized in that the fixed leg and the moving leg are vertically arranged in parallel, the number of the hinge links is four, the left and right sides are set tohave different thicknesses by four diagonal lines, every two hinge links are buckled to be square to form two opposite apex angles, and the two ends of the fixed leg and the moving leg are connectedinto a dynamic whole by the hinge shafts. Compared with the prior art, the compass has the advantages that the fixed leg is always in a vertical state during use, the gravity center of gravity is stable and easy to control, the moving leg vertically and horizontally stretches and retracts, the angle of the brush head is not affected by the radius, the lines drawn are even and smooth, the circle orarc is more stable, easy to control and attractive. Therefore, the compass has good application and promotion value.

Description

1. Technical field: [0001] The invention relates to stationery, in particular to a compasses with two parallel legs and one leg that expands and retracts horizontally. 2. Background technology: [0002] Compasses, whose basic function is to draw circles and arcs, are commonly used stationery for studying and working in related fields. The compasses in the prior art take the joints with damping resistance at the tops of the two legs as the axis, and the two legs move outwards or inwards in fan-shaped synchronously to complete drawing operations with different radii. The main problems are: 1. The gravity center of gravity of the operation is in the middle of the two legs, and the fixed position of the legs of the center of gravity needs to be realized by artificial dynamic adjustment. When the radius is small or large, the control is difficult and often causes the fixing pin to slide Or shift, easy to damage the paper or to the failure of drawing. 2. The tip of the brush is ...

AI Technical Summary

Problems solved by technology

The main problems are: 1. The gravity center of gravity of the operation is in the middle of the two legs, and the fixed position of the legs of the center of gravity needs to be realized by artificial dynamic adjustment. When the radius is small or large, the control is difficult and often causes the fixed pin to slide Or shift, easy to damage the paper or to the failure of drawing

2. The tip of the brush is in a tilted state, which makes the drawing lines uneven, especially when using a duckbill-shaped brush tip, the drawing line is often interrupted or the outer edge is incomplete

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