Dec. 3, 1946.. O, s, SHAFFER ‘ - 2,411,981 DRAFTING INSTRUMENT Filed May v11, 1944 ’ _ 2 Sheets-Sheet 1 ' _.\;$- _ ‘_. 1 .1% / ' Inventor 010870 5, 5700/ er ., By ' @Mm WWW may‘ Dec. 3, 1946. ' o, s, SHAFFER 2,411,981 DRAFTING I NS TVRUMENT Filed May 11, 1944 2 Sheets-Sheet 2 177. d - /»7/ \’9 ' V - -. ' v Invenfor Owens 5W6?’ v i'w-m My“? 75%;” 2,411,981 Patented Dec. 3, 1946 UNITED STATES PATENT OFFICE 2,411,981 DRAFTING INSTRUMENT of one vOwen S. Shaffer, Omaha, Nebn, assignor half to Eugene D. O’Sullivan, Omaha, Nebr. Application May 11, 1944, Serial No. 535,055 1 Claim. (01. 33-110) 2 1 . . The present invention relates to new and use ful improvements in drafting instruments and more particularly to a device of this character through the use of which section lines or cross hatching may be marked on the drawings at reg ular and equally spaced distances apart. An important object of the present invention is to provide a straight edge or ruler having grad uations marked thereon at one edge, one end of > - Referring now to the drawings in detail and ?rst with respect to the form of the invention illustrated in Figures 1 to 6, inclusive, the nu meral 5 designates a ruler having a ?xed stop 6 projecting laterally from one edge thereof, the surface of the ruler being marked with gradua tions 1 in inches and fractions thereof. .A longitudinal slot 8 is formed in the ruler adjacent its end opposite from the ?xed stop 6, the rear or bottom surface of the ruler, at the the ruler haVing a ?xed stop and providing an 10 edges of, the slot 8, being rabbeted as shown at 9. . adjust-able stop on the ruler and between which An adjustable stop extends transversely across a conventional form of triangle may be positioned, the surface of the ruler 5 and is formed at one the adjustable stop cooperating with one edge of edge with a flange or elongated head ll adapted the triangle to regulate the distance which the to slidably engage one edge of the ruler. The triangle may be moved between the stop to de 15 stop I0 is formed at its central portion with an termine the distance between the section line opening I2 through which a set screw I3 is freely or cross-hatching to be drawn at the edge of the inserted, the set screw having threaded engage triangle. ment in a threaded opening 14 of a rectangular A further important object is to provide guide shaped slide block Or nut 15 snugly ?tted for slid means for the adjustable stop which will elim ing movement in the slot 8 and having flanges inate play between the adjustable stop and the 16 at its outer surface conformably received in ruler to a minimum, whereby to promote accu the rabbeted formation 9 of the ruler so that the racy in the adjustment of the stop. outer surface of the slide I5 is ?ush with the rear A still further object is to provide a device of surface of the ruler 5 as will be apparent from this character of simple and practical construc 25 an inspection of Figure 4 of the drawings. tion, which is neat and attractive in appearance, The flange 1 I of the adjustable stop I0 and the relatively inexpensive to manufacture and other slide l5 cooperate to maintain the side edges of i wise well adapted for the purposes for which the the stop 10 in substantially true parallelism with same is intended. 30 the marking forming the graduations ‘I. Other objects and advantages reside in the de In the form of the invention illustrated in tails of construction and operation as more fully Figures 7 to 9, inclusive, the ruler is designated at hereinafter described and claimed, reference be H having the ?xed stop l8 at one end and formed ing had to the accompanying drawings forming with the longitudinally extending slot l9. One part hereof, wherein like numerals refer to like end of the slot 19 is enlarged to receive an an 35 parts throughout, and in which choring block 20 for a screw 2| which has a ball Figure 1 is a plan view showing the device in 22 at one end swivelly received in the block 20, operative position, the screw extending longitudinally in the slot l9 Figure 2 is an edge elevational View of the ruler. and outwardly through the end of the ruler op Figure 3 is a fragmentary longitudinal sec posite from the ?xed stop l8. The outer end of tional view taken substantially on a line 3-3 of 40 the screw is formed with a manipulating head 23. The adjustable stop is designated at 24 having Figure 1. Figure 4 is a transverse sectional View taken the ?ange 25 at one end slidably engaged with substantially on aline 4-4 of Figure 1. one edge of the ruler and also having a longi Figure 5 is a perspective view of the adjustable 45 tudinally extending rib 26 at its intermediate por stop. tion slidably engaged in the slot l9. The screw Figure 6 is a similar view of the slide nut form 2| is threaded through the rib 26 whereby a ro ing part of the adjustable stop. tary movement of they screw will cause a longi Figure 7 is a side elevational view of a modi?ed tudinal movement of the adjustable stop 24 rela construction for slidably actuating the adjustable 50 tive to the ruler I1 in a manner as will be ap stop. parent. The surface of the ruler I1 is likewise Figure 8 is a transverse sectional view taken substantially on a line 8-8 of Figure 7, and Figure 9 is a fragmentary longitudinal sectional view taken substantially on a line 9—9 of Fig ure 7. formed with graduations 21 as heretofore ex plained for cooperation with the side edges of the adjustable stop 24. 65 In using the device a conventional form of tri 3 2,411,981 angle 28 is positioned with one edge thereof abut ting the ruler 5 between the ?xed stop 6 and the adjustable stop It]. The opposite edge of the ruler 5 may be placed against a conventional form of straight edge indicated at 29, if desired. One edge of the triangle 28 is placed in abut ting engagement with the ?xed stop 6 and the adjustable stop 8 is spaced from the opposite edge of the triangle a desired distance in accordance with the spacing of the section lines or cross hatching to be drawn. The triangle is then moved into abutting engagement with the adjustable stop l0 and the ?rst section line indicated at 30 is then drawn and the triangle then moved to 4 understood from the foregoing without further detailed explanation. Having described the invention, What is claimed as new is: In a device of the class described for use with a triangle, a straight edge against which the tri angle is adapted to be positioned in edge to edge engagement therewith and having an edge stop at one end for engagement by said triangle and a longitudinal slot therein adjacent its other end provided with rabbeted sides, an adjustable stop comprising a member slidably opposed to one - side of the straight edge and having a ?ange overlying and ?tting against the edge of the ward the left until it engages the ?xed stop 6 15 straight edge with which the triangle is adapted and the next section line is then drawn parallel to be engaged, a slide ?tted in said slot ?ush with to the line 30. The ruler 5 and triangle 28 are the other side of the straight edge and having then successively moved to continue the mark edge ?anges ?tted in said rabbeted sides of the ing of the section lines or cross-hatching in a slot, and a screw threaded through said member manner as will be apparent. 20 and slide to clamp the same to the sides of the It is believed that the details of construction straight edge. . and manner of use of the device will be readily OWEN S. SHAFFER.