Folding ruler has scale element that includes one folding side with two scale marks in which ascending and descending numerical values are provided along counting direction respectively

摘要

The folding ruler (10) has elongate flat bars trained scale elements (20, 22, 24, 26, 38) that are connected at joints (18). The scale element (24) has opposite folding sides (42,44) with scale marks (46) in which ascending numerical values are provided along counting direction. The folding side (42) includes scale mark (70) in which decreasing numerical values (72) are provided along counting direction. The adjacent scale element (26) is connected to scale element (24) includes sides formed with scale marks in which ascending numerical values are provided along counting direction.