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US 4,974,330 AGranted
Angle drafting set
OwnerPaul B. Covertinventor
Life of this patent
Estimating the term…
Abstract
An improved angle drafting set is provided and consists of a trapezium tool and an angle modifier tool. The trapezium tool is so constructed that a person can accurately draw angles in five degree increments between zero degrees and three hundred and sixty degrees. The angle modifier tool is so constructed that when used in conjunction with the trapezium tool the person can accurately draw angles in whole degree increments between zero degrees and three hundred and sixty degrees with the trapezium tool.
Claims6
An improved angle drafting set comprising:
- (a) a trapezium tool having two long edges of equal length and two short edges of equal length, whereby the two long edges form an angle of forty five degrees, while the two short edges opposite from the forty five degree angle form an angle of one hundred and thirty five degrees and where each of the two long edges meet with each of the short edges an angle of ninety degrees is formed, said trapezium tool further having four elongated slots therein, wherein the first slot is placed at a five degree angle from one of the long edges, while the other three slots are placed at ten degree increments from the first slot so that by positioning said trapezium tool in various positions against a T-square a person can accurately draw angles in five degree increments between zero degrees and three hundred and sixty degrees;
- and
- (b) an angle modifier tool having a straight bottom edge and a top edge divided with one side at a one degree angle and the other side at a two degree angle so that when said angle modifier tool is used in conjunction with said trapezium tool on the T-square the person can accurately draw angles in whole degree increments between zero degrees and three hundred and sixty degrees.
Dependencies are inferred from the claim text.