Apparatus for drawing lines and marking measurements and inscriptions on drawings

Claim 1

APPARATUS FOR APPLYING INDICIA ON DRAWINGS ON A DRAWING BOARD OR THE LIKE COMPRISING AN ELONGATED GUIDE RAIL HAVING A FLAT LOWER SURFACE FOR RECEIPT OF A DRAWING ONTO WHICHINDICIA IS TO BE APPLIED, SAID RAIL INCLUDING A VERTICAL RIB INCLUDING AN UPWARDLY OPENING, LONGITUDINALLY EXTENDING RACEWAY PORTION THEREALONG, A PRINTING ASSEMBLY RECIPROCABLY MOUNTED ON SAID VERTICAL RIB, SAID PRINTING ASSEMBLY INCLUDING A PAIR OF SPACED GUIDE WHEELS ROTATABLY MOUNTED IN COPLANAR RELATION AND RECEIVED ON SAID RACEWAY PORTION, SAID PRINTING ASSEMBLY INCLUDING A LATERALLY PROJECTING SUPPORT PORTION AT ONE SIDE OF SAID RAIL, A THIRD GUIDE WHEEL JOURNALED ON SAID SUPPORT PORTION IN PARALLEL RELATION TO SAID PAIR OF GUIDE WHEELS PROVIDING A THREE POINT, ANTI-FRICTION SUPPORT FOR SAID PRINTING ASSEMBLY, SAID PRINTING ASSEMBLY INCLUDING AT LEAST ONE OPERATING KEY AND VERTICALLY PIVOTAL TYPE LEVER, SAID SUPPORT PORTION INCLUDING INKING MEANS ADJACENT SAID THIRD GUIDE WHEEL FOR ENGAGEMENT BY TYPE ON SAID TYPE LEVER WHEN TYPE INDICIA IS APPLIED.