Патент USA US2410864код для вставки
NW. 12, 1946. - Y H. BROWN ' 2,410,864 DRAFTING VINSTRUMEN'I . Filed May 15, 1944‘ ifa‘rold Brown‘, 7 a», f?fadu; 2,410,864 Patented Nov. 12, 1946 UNITED'V'STAT‘EJS PATENT 2,410,864 -DRAFG INSTRUMENT I s HafQldBrown, Denver, 0010. Application May is, 1944, Serial No. 535,715‘ . —' 2 Claims. (01. 33-410) 1 , screws 20 also extend 2 through the sudesvwm ~ I. My invention relates to a drafting instrument and my object is to provide an e?icient low cost secure the latter to the inner member-l2.’ The inner member I2 and the’ strip l8 have reduced instrument of this character which may be em ployed to advantage by architectural andrme chanical draftsmen, designers, artists, teachers, overlapping portions which ~cooperater'with the screws 20 and thumb-nuts‘ 22 in holding the mem ber I2 and the strip I8 in assembly; ‘1- Thelfront side of the rectangular member 2 is beveledas in students and others having use for an instrument of this character. ‘I dicated at 26 toprovide a ruler edge 30] forlgui-d The primary object of the invention is the pro ing the point of a‘pencil or ruling pen'i'u'sed‘in vision of a drafting instrument whereby ,the aid of which cross-hatching and surface shading can 10 drawing the cross-hatching or other parallel lines. be uniformly and expeditiously accomplished by Operation-In using the instrument the de a novice as accurately as by the most experienced sired spacing between cross-hatching or other draftsman. parallel lines to be drawn may be obtained by A further object is the provision of an instru moving the inner member [2 backward against 16 ment of this character which may be used as a the front edge 34 of the rear side 6 of the outer parallel ruler, compass, protractor, letter spacer member 2. The thumb-nuts 22 are then loosened and in drafting hexagonal and other geometrical and the adjustable strip I8 is moved backward ?gures, ' from the rear edge 36 of the front side 4 a dis Another object is the provision of a simple and inexpensive drafting instrument of this character 20 tance equal to the desired spacing of the lines. The thumb-nuts 22 are then tightened to ?rmly which can be manufactured from cardboard, plas secure the adjustable strip l8 from independent tics and other suitable materials at low cost. movement upon the inner member l2. The outer Other objects will hereinafter appear and in member 2 is now moved backward until the edge order that the invention may be fully understood reference will now be had to the accompanying 25 36 contacts the frontedge 32 of strip [8. The initial line is then drawn by moving a pencil or drawing, in which: pen along the front edge 30 of the outer mem Fig. 1 is a front elevation of one form of the ber 2. Spacing for the second line is then ob instrument. tained by moving the inner member l2 backward Fig. 2 is a cross section on line 2—2 of Fig. 1. Figs. 3 and 4 illustrate modi?cations of the 30 against the edge 34 of the outer member 2 and then moving the latter backward until its edge instrument. Referring more particularly to the form dis closed by Figs. 1 and 2,2 designates an outer rectangular member comprising front and rear sides 4 and 6, respectively, and end members 8, which latter unite the former. The outer rec tangular member 2 has a rectangular opening H1 35 36 contacts the front edge 32 of the strip l8. Equal spacing for additional lines is obtained by repeating the foregoing operations. If preferred the adjustable strip l8, or its equivalent, may be applied to the outer member 2 and arranged to project into the path of the member l2 to check independent movement of the inner and outer members when being operated as above described. In the form disclosed by Fig. 3, parts similar bly with the outer member 2 by slides M which to those disclosed by Figs. 1 and 2, have been cor are secured to the inner member and project respondingly numbered with the addition of ex into grooves [6 in the respective end members 8. ponents a. The slides l4, grooves l6, adjustable The inner member I2 is provided at its for strip 18, screws 20 and thumb-nuts 22 have been ward portion with a strip 18 adapted to be ad justed forward or backward relatively to the rear 45 dispensed with and onespacing of lines to be drawn is obtained by making the inner member edge of the front side 6 to vary the spacing be l2a narrower than the opening Illa in the outer tween cross-hatching or other parallel lines of member 2a to leave a space 3 which determines a drawing. The strip I8 is secured in any of the spacingybetween lines when the outer and its adjusted positions upon the member l2 by any suitable means, such, for example, as screws 20 50 inner members 2a and I2a, respectively, are op erated in the same manner as the members 2 and and thumb-nuts 22, which latter are threaded I2. In order to obtain greater spacing between upon the former. The screws 20 are ?xed to the lines the movable element Hat is made shorter member 12 and extend through slots 24 in the than the opening |0a to leave a space 5 which adjustable strip 18 to permit forward or, back ward adjustment thereof, as above stated. The 55 is wider than the space 3. For convenience of in which an inner member I2 is movably ar ranged. The inner member I2 is held in assem ' ' 2,410,864 the draftsman this device may be equipped with various accessories which are optional with the manufacturer. In the present instance I have shown accessories comprising a scale 38, a pro tractor 40, geometrical ?gures 42, 44 and 46, and perforations 48 for insertion of a pencil point whereby dots may be made from which guide lines may be drawn for letters and numbers to be drawn on an underlying sheet of paper. ‘ 4 or other parallel lines and comprising two ele ments having reduced overlapping portions slid able on each other whereby the width of the in ner member may be adjusted relatively to the opening in the outer member and thereby vary the spacing of the lines, manual means for se curing the two elements in adjusted position, and slides on one member projecting into grooves in the companion member to operably hold the The form disclosed by Fig. 4 comprises outer 10 members in assembly, ‘ . and inner members 21) and 12b, respectively, pro 2. A drafting instrument comprising an outer vided with edges extending at angles of various member having a marginal ruling edge and an degrees. Additional angles are provided by the opening, an inner member slidable in said open edges surrounding triangular openings 50 and 52 ing to determine the spacing for cross-hatching formed in the outer and inner members 2b and I 2b, respectively. - From the foregoing description it is apparent that I have provided a drafting instrument pos sessing the advantages above pointed out, and while I have shown and described three different forms of the device I reserve all rights to such other forms and modi?cations thereof as fall within the scope of the invention as claimed. Having thus described‘ my invention, what I claim and desire to secure by Letters Patent is: 1. A drafting instrument comprising an outer member having a marginal ruling edge and an opening, an inner member slidable in said open ing to determine the spacing for cross-hatching or other parallel lines and comprising two ele ments having reduced overlapping portions slid able on each other whereby the width of the in ner member may be adjusted relatively to the opening in the outer member and thereby vary the spacing of the lines, threaded means ?xed in one element and projecting through parallel slots in the companion member, manual means threaded upon said threaded meansvto cooperate therewith in holding said elements in adjusted 25 position, and means projecting from one member and slidable in grooves of the companion mem ber to hold said members in assembly. HAROLD BROWN.