JP2001026197A - Compasses - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pair of compasses, with which a neat circle can be easily drawn. SOLUTION: This pair of compasses is operated with both hands by assembling a revolving leg 1 and a center leg 2 in a two-fork shape by means of a fulcrum 3 at the middle of the revolving leg 1. A circle is drawn by pushing a center lead 7 while holding a grip 4 with one hand and revolving the revolving leg 1 while holding an idle-rotation grip 5 with the other hand. The grip 4 and the center lead 7 are held vertically. A line-drawing lead 6 and the fulcrum 3 arranged on the circumferences of one and the same circle as a center. The grip 4 is located at all times just above the center lead 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compass that is shaped like a person around a fulcrum so that a beautiful circle can be easily drawn.

[0002]

2. Description of the Related Art A conventional compass has an inverted V-shaped leg and a fulcrum at the top. The radius was determined by opening and closing the legs, and the knob above the fulcrum was operated with two fingers of one hand to draw a circle.

[0003]

The compass has two operations, an operation of determining a radius and an operation of drawing a circle. A conventional compass generally draws a circle by operating with two fingers of one hand. Turning the knob, moving the position of the knob in a circle, balancing the pressing force of the center leg and the rotating leg, had to be done simultaneously. This operation was subtle and difficult, and it was difficult to draw beautiful circles. The drawback was the poor operability when drawing this circle. The present invention takes advantage of the simple and excellent operability of opening and closing the legs around the fulcrum when determining the radius, and by devising a mechanism that can remove the conventional disadvantages when drawing a circle. is there. It is another object of the present invention to provide a compass that enables even a young person to easily draw a beautiful circle.

[0004]

Means for Solving the Problems (a) The compass is operated using both hands in consideration of disassembling the function of drawing a circle and sharing the function with a plurality of hands and fingers. One leg was extended above the fulcrum so that the center could be pressed with one hand and the other hand could be rotated to draw a circle. That is, the rotating leg 1 and the center leg 2 were combined in a human shape. One hand is center core 7
, And the other hand rotates the rotating leg 1 to draw a circle. (B) The rotating leg 1 is shifted outward from the fulcrum 3 so that the idling knob 5 moves substantially the same as the line drawing core 6. (C) Conventionally, when drawing a circle, the knob is not necessarily located directly above the center of the circle and moves in a circle. Therefore, the knob 4 center core 7 is arranged on the same vertical line, and the three points of the knob 4 center core 7 drawing core 6 are arranged on the same circumference centering on the fulcrum 3. Accordingly, the knob 4 is always located directly above the center core 7 regardless of how the radius of the circle is changed. As described above, the present invention improves operability when drawing a circle while maintaining operability when determining a radius,
Solved the problem.

[0005]

Embodiments of the present invention will be described below. (A) The rotating leg 1 was provided with a knob 4 and an idling knob 5 and combined at the center leg 2 and the fulcrum 3. The rotating leg 1 and the center leg 2 were curved to secure space so that the rotating hand could rotate and move without hitting the leg. (B) In order to shift the rotating leg 1 outward from the fulcrum 3, a projection is provided at the center of the rotating leg 1, and the fulcrum 3 is taken there. (C) The knob 4 center core 7 is arranged on the same vertical line, and the three points of the knob 4 center core 7 line drawing core 6 are arranged on the same inner circumference centering on the fulcrum 3. (D) Particularly when drawing a circle with a large radius, in order to prevent the compass from opening halfway, two extension plates 8 were extended from the fulcrum 3 and the center leg 2 was clamped.

[0006]

The present invention has the following effects. (A) By operating with both hands, the operation of each hand is simplified and the operation is simplified. In the case of a right-handed person, the left hand has the knob 4, but hardly moves, so that the center core 7 can always be pressed from directly above. Further, since the idler knob 5 makes almost the same movement as the line drawing core 6, the right hand can hold the idler knob 5 and rotate the rotary leg 1 while pressing the line drawing core 6 with a stable pressure to draw a circle. In other words, you can easily draw a beautiful circle using both hands. However, the drawing core 6 must always be adjusted to an appropriate length. (B) Conventional compasses usually had a straight shape, and many felt hard and cold. This compass solved the functional problems, and at the same time, made the design gently cute with curves.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is an operation diagram of the present invention.

FIG. 3 is a diagram illustrating a shape change according to a change in a radius according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating leg 2 Center leg 3 Supporting point 4 Knob 5 Idling knob 6 Line drawing core 7 Center core 8 Extension plate

Claims (2)

[Claims] 1. A compass in which a rotating leg 1 provided with a knob 4 and an idling knob 5 and a center leg 2 are combined in a human shape at a fulcrum 3 at the center. 2. The knob 4 center core 7 is arranged on the same vertical line, and the three points of the knob 4 center core 7 and the drawing core 6 are arranged on the same circumference centering on the fulcrum 3. Compass just above 7