Multifunctional compasses

A multifunctional and compasses technology, which is applied in the direction of circular curve plotters, printing, writing utensils, etc., can solve problems such as failure to achieve expected requirements, lack of practicability, and single structure

Inactive Publication Date: 2017-07-14
周巽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the compasses on the market have a single structure and can only realize the function of drawing a circle, and the radius of the drawn circle often needs to be obtained with the help of other rulers.
[0004] CN204820798U discloses a kind of structural concept of multi-purpose compass: can't realize the multi-purpose compasses with real mea...

Method used

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  • Multifunctional compasses

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Embodiment Construction

[0020] The specific implementation manners of the present invention will be further described below according to the accompanying drawings.

[0021] according to figure 1 As shown, the specific data in this embodiment can be determined as follows:

[0022] On the basis of the compass of regular size (for example: the length of the compass P head is 3 cm, the distance from the tip of the needle 4 to the central axis 5 is 10 cm),

[0023] On one of the compass legs 2, the position of the arc-shaped scale F on the compass P is fixed by two upper and lower positioning screws 5. At the same time, the arc center of the arc-shaped scale F must coincide with the central axis 5 at the end of the compass leg 2. ;

[0024] The arc-shaped ruler F is set to a 1 / 3 arc with an inner diameter of 5 cm and an outer diameter of 6 cm (that is, for example, the set angle marking scale t has a range of 120 degrees);

[0025] The angle marking scale t at the upper end of the arc-shaped scale F is...

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Abstract

The invention discloses a pair of multifunctional compasses. On the basis of a current compass structure (P), the pair of multifunctional compasses is characterized in that an arc scale plate (F) which separately shows angle indication scales (t) and length indication scales (u) is arranged on one compass leg (3); besides, the arc center of the arc scale plate (F) coincides with a central shaft (2) at the end parts of two compass legs (3); the distances from the central shaft (2) of the compasses (P) to two pin points (4) are identical; the intervals of the length indication scales (u) on the arc scale plate (F) are constrained by the identical distances; the intervals of the angle indication scales (t) are identical, and are determined according to the scales of a conventional protractor; and the intervals of the length indication scales (u) are determined according to an integrated cosine law, are unequal, and are constrained by the distances from the pair of pin points (4) to the central shaft (2). The technique is crucially characterized in that the cosine law that c<2> equals a<2> plus b<2> minus 2abcosC is integrated into a more practical equation, namely, c<2> equals 2b<2>(1 minus cosC), and design and use of the compasses are directed by the latter equation.

Description

technical field [0001] The invention relates to compass technology, in particular to a multifunctional compass technology capable of measuring both angle and length. [0002] technical background [0003] At present, most of the compasses on the market have a single structure and can only realize the function of drawing a circle, and the radius of the drawn circle often needs to be obtained with the help of other rulers. [0004] CN204820798U discloses a kind of structural concept of multi-purpose compass: can't realize the multi-purpose compasses with true meaning according to this structural concept, for example, its arc scale does not provide key arc center position, and its length scale scale is equidistant again (See the schematic diagram of its accompanying drawing-should be unequal spacing according to the law of cosines), therefore, can't realize its expected requirement in use, promptly do not have practicability. Contents of the invention [0005] Purpose of the ...

Claims

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Application Information

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IPC IPC(8): B43L9/02B43L9/00
CPCB43L9/02B43L9/007
Inventor 周巽
Owner 周巽
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