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Document Number
US Patent 4551923
Issued Date
November 12, 1985
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Abstract
A drawing triangle is disclosed having 30-, 45-, and 105-degree angles. A perpendicular starting from the vertex of the obtuse angle meets the base at a right angle, from the point where said perpendicular meets said base a set of three reference lines extends making angles of 7 degrees, 30 degrees, and 42 degrees with the base line respectively. Inside the edges of the drawing triangle a set of three base lines each parallel to its corresponding edge are further provided. Between said inner base lines and the edges of the triangle, sets of broken parallel lines are provided which can be used to draw parallel lines with accuracy. Sets of scales are also provided along said perpendicular and the base edge of the drawing triangle.
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Drawing triangle - US Patent 4551923 Drawing
Drawing from US Patent 4551923
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Number of Claims:
10
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Owner
Chiang; Hou Sheng (Taipei,TW)
Published
November 12, 1985
Application Number
06/613,578
Filed
May 24, 1984
US Classification
33/476   33/482 D10/65
Int'l Classification
B43L   7/027   (20060101)   B43L   7/00   (20060101)  
USPTO Field of Search
33/474   33/476   33/482  
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