PROTRACTOR Russian patent published in 2022 - IPC B43L13/00 

FIELD: measuring technology.

SUBSTANCE: invention relates to drawing, measuring accessories, tools, namely to protractors. The protractor contains an angle-measuring circular scale adjacent to a transverse horizontal level, in the center of which there is an attachment unit with a removable rotating bar fixed on it, the spout of which slides along the deflection scale. In the first version of the protractor, at least two through grooves are made in the bar, located at an angle not exceeding 180° relative to the side surface of the bar. Another version of the protractor is also disclosed, containing a through groove in the bar, in which at least one movable carriage containing at least one device with a coloring substance is placed.

EFFECT: expanding the list of consumer properties with the possibility of drawing parallel straight and curved lines with a certain step and at the right angle.

8 cl, 4 dwg