Drafting device

A drafting device comprising:

• a base frame (10) having an upper surface, a lower surface, and four corners;
• a pair of magnetic boards (11) securely mounted to said upper and lower surfaces of said base frame (10) respectively;
• a ruler (40) movably engaged on one of said magnetic boards (11);
• a pair of cavities (13) defined in each of the four corners of said lower surface of said base frame (10), a protrusion (12) being formed between said pair of cavities (13);
• a guiding member (20) securely mounted to each of the four corners of said base frame (10) and including:
• a locking block (21) having a first wall member (22) and a second wall member (23) mounted on said upper and lower surfaces of said base frame (10) respectively, a slot (230) being defined in said second wall member (23) through which said protrusion (12) is received;
• and
• a recess (24) defined in an underside of said locking block (21) between said first and second wall members (22) and (23), said recess (24) having a width equal to the distance between a bottom face of said cavity (13) and said upper surface of said base frame (10);
• and
• a guiding line (30) looping around each of said guiding members (20) and passing through two ends of said ruler (40).