Compasses

A compass and disc technology, applied in the field of compasses, can solve the problems of non-uniform reference of compass nibs, creeping errors of gears, racks or threaded rods, re-adjustment of nibs, etc.

Inactive Publication Date: 2017-08-18
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a compass, which effectively solves the problem that the datum of the compass pen tip is not uniform and the position of the pen tip needs to be readjusted when drawing a circle in the half-turn-one-circle method, and at the same time avoids the problem of Errors due to creep between gears, racks or threaded rods

Method used

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Embodiment Construction

[0009] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0010] Depend on figure 1 and 2 Provided, the present invention comprises box body 1, and box body 1 top and bottom have horizontal semi-circumferential groove, and two half-circumferential grooves are parallel and different sides, and box body 1 interior is fixed with horizontal first bevel gear 2, and the first bevel gear There is a second bevel gear 3 below 2, the first bevel gear 2 and the second bevel gear 3 are parallel, the parameters of the first bevel gear 2 and the second bevel gear 3 are the same and the axis positions coincide, the first bevel gear 2 and the second bevel gear There is a third bevel gear 4 in the middle of the gear 3 and meshed together through the third bevel gear 4 to form a structure in which the first bevel gear 2 and the second bevel gear 3 rotate in opposite directions around the first ...

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Abstract

The invention provides compasses capable of effectively solving the problems that according to compasses drawing circles in a half-rotation one-circle manner, the standard of pen points is not unified, and the positions of the pen points need to be adjusted again. The compasses comprise a box. A first bevel gear is fixed in the box. A second bevel gear is arranged below the first bevel gear. The first bevel gear is parallel to the second bevel gear. A third bevel gear is arranged between the first bevel gear and the second bevel gear. A handheld disc is arranged on the lower end face of the box, a positioning needle is arranged on the lower end face of the handheld disc, and three stand bars are further arranged on the lower end face of the handheld disc. Antiskid soft cushions are arranged at the lower ends of the three stand bars. An upper ruler is fixed to the first bevel gear, and the other end of the upper ruler stretches out of the box. A lower ruler is fixed to the second bevel gear, the other end of the lower ruler stretches out of the box, and the upper ruler and the lower ruler are arranged on the same side and are placed in parallel. The upper ruler is provided with a drawing pen horizontally sliding on the upper ruler, and the lower ruler is provided with a drawing pen horizontally sliding on the lower ruler.

Description

technical field [0001] The invention belongs to school supplies, in particular to a compasses. Background technique [0002] In mathematics and drawing, a compass is a tool used to draw a circle or a chord, and is often used for drawing with a ruler. Compasses are usually made of metal and consist of two parts connected by a hinge, which can be adjusted. Now it is more common to use two-legged compasses. One compass foot is equipped with positioning pins, and the other compass foot is equipped with chalk, pencil or duckbill tip. The existing relatively advanced half-turn-one-circle method is used to draw circles. , the structure is: the middle position of the center of the circle is connected to both sides simultaneously with a slidable telescopic structure with scales, and the two telescopic structures are respectively connected with a drawing pen, which simultaneously draws a circle from two symmetrical sides. [0003] Although drawing a circle by half turning a circle c...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B43L9/02
CPCB43L9/025
Inventor董建伟朱军辉程春蕊李士恒娄光谱
OwnerZHENGZHOU UNIVERSITY OF AERONAUTICS