PROTRACTOR

PROTRACTOR

  • CN 1,062,696 A
  • Filed: 09/09/1991
  • Published: 07/15/1992
  • Est. Priority Date: 09/09/1991
  • Status: Abandoned Application
First Claim
Patent Images

1. , " protractor " is divided into work chi (1) and main scale (2), be carved with on the work chi (1) on cms and its rotating disk and be carved with the angle number, the rotation of work chi drives rotating disk and rotates in the hole of main scale (2), the angle of rotating be by the indication lines on main scale (2) outer ring point out (as being angle index on the outer ring, the indication lines should be on rotating disk), the method that can indicate out on drawing is:

  • the increasing central shaft utilization of rotating disk cracks method and draws an elongated hole, its length is the radius that adds big axis core, width drawing pen can free in and out and is as the criterion, the position on its one side and ruler are point-blank, we just can draw angle line very easily like this, it is characterized in that " protractor " all has one to add big axis core, utilization cracks and adds big axis core and draw a fixing angle starting point of painting to the way of the central point of its radius, utilization adds big axis core and obtains a unfixed angle starting point of painting, and " new set square " comes to this;

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