US2603908A - Drawing board attachment - Google Patents

Description

July 22, 1952 S F L 2,603,908

DRAWING BOARD ATTACHMENT Filed May 11, 1950 IN V EN TOR.

c/'cq a as $072 Wefe Z,

Patented July 22, 1952 This invention relates to drawing boards and has special reference to an attachment for boards of this class, the device being preferably termed a drawing board apron. I I

In the use of drawing'b'oards'in which the distance from the edge at which the draftsman stands or sits to the opposite edge is inconveniently distant, difiiculty is experienced in drawing on paper of corresponding distance between its top and bottom edges when fully exposed on the board. In the wider sheets of paper it is often necessary for the draftsman, in order to ,reach the upper part of the sheet, to stand on a stool or'the" like and assume a half reclining positionfw 'One important object of this invention is'to provide a novel attachment for drawing boards permitting the use of a sheet as wide or even wider than the board on which it is fastened while that part of the sheet on which the draftsman is working is at all times conveniently within his ordinary reach.

Draftsmen sometimes attempt to keep the upper part of a sheet pinned on a board conveniently in reach by allowing the lower part of the sheet to hang down over the front edge of the board. This not only tends to crease the sheet at the board edge but also exposes the part hanging down to contact with the draftsmans clothing and possibly becoming soiled.

Another object of the invention is to provide a drawing board attachment whereby the lower part of a sheet may hang over the front edge of a drawing board without creasing.

A further object of the invention is to provide a novel attachment for drawing boards so arranged as to guard 2. depending portion of a drafting sheet having its upper part pinned on the board from pressure by the draftsmans clothing.

With the above and other objects in view, as will be presently apparent, the invention consists in general of certain combinations of parts and arrangements of details hereinafter fully described, illustrated in the accompanying drawings and particularly claimed.

In the drawings, like characters of reference indicate like parts in the several views, and

Figure 1 is a perspective view of a drafting board with this attachment secured thereto.

Figure 2 is an enlarged detail section on line 2-2 of Figure 1.

Figure 3 is an enlarged detail section on line 3--3 of Figure 2, and

ES PAT E'NTg0F-FiICEe, YQDRAWING BOARD ATT onM u i ,lacuue s Schwefel, Los Angeles, 7

1 "Application May 11, 1950, Serial No. e sssfjj '2Claims. (01.45 131) Figure 4 is a transverse section through a certain apron forming :part oflthis-invention;

In the embodiment of'theinvention disclosed in the drawings, there is shown a drawing board In of the usual rectangular shape and-having a forward edge II at which the draftsman' stands or sits to work. With the distance fromthe edge ID to the opposite edge I2 being too great for the draftsman to reach conveniently while drawing lines on paperipinned .to the board, it becomes necessary for the draftsman .to assume an awkward and uncomfortable position while drawing.

Ashere shown, a, sheet-of drafting paperisill'ustrated on the board l0,; the position of .the sheet when entirely supported on the upper face of the board being shown; in broken lines I3. This often brings the top edge of such a sheet too far from the draftsman who seeks to overcome this trouble by positioning the sheet as shown by the full lines I4 when working on the upper part of the sheet. In order to prevent the formation of a crease in the sheet by the upper angle of the edge II there is provided in the present invention a guard strip I5 one face I6 of which is flat. The other side of the strip I5 has a surface comprising a narrow arcuate portion I1 extending from the upper edge of the side I6 and, when the strip is secured to the board it is in such position that the upper surface of the board extends tangentially from the arcuate portion I1. This portion I1 merges smoothly into a wide arcuate surface I8 from which extends a flat tangential surface I9 leading to the lower edge of the face I6. The guard strip thus, as shown in Figure 2, prevents creasing of a sheet such as S when the lower part thereof depends from the front of the board It. The use of the guard strip alone will not prevent rubbing of the draftsmans clothing against the sheet S at the front edge of the board. This guard strip is secured to the board by nails or screws as shown at 20.

In cooperation with the guard strip I5 there is provided an apron for preventing rubbing and soiling of the sheet is at the part depending over the guard strip. The apron is made of sheet metal, molded from plastic material or otherwise formed. The apron engages over the guard strip for its entire length and includes a longitudinally extending thin body portion having a narrow transversely arcuate portion 2| which merges into a. wide transversely arcuate portion 22, the radii of these portions being longer than the respective radii of the strip I5 at I! and I8. Extending tangentially from the portion 2| and, when mounted on the board I 0, overlying the 3 front edge portion of said board is a cover strip 23. At each end of the cover strip 23 there is provided a downwardly directed integral spacer rib 24 for holding the cover strip in proper spaced relation above the board I0. Extending tangentially from the portion 22 at the lower edge thereof is a portion forming a sheet guide 25 which extends downwardly below and inwardly or the lower edge of the guard strip l5. At each end of the apron is -ia wehflfilhaving a'str-aight adge fl in the planebfthe face"l'6 to rest agai'nbtthe edge H of the board I0. This apron is attached to the board by nails or screws 28. As thus arthe curved portion of the apron and across the plane of the fiat side of the strip, and depending spacer ribs extending downwardly from the underside of the first mentioned plane portion of the apron to hold the same spaced from a board for the passage of paper beneath the apron.

2. A drawing board attachment including a guard strip having a flat surface to engage against one edge of a, drawing board and having a curved surface over which araamgflpa er may 'travel, an apronhaving'a 'curvwportion extending around and spaced from said curved surface,

' "said apron having a plane portion extending from ranged, there is provided a continuouserchannel H around the outer face of the guard strip with cover strips and guide strips extendingi'froin the upper and lower edges of thisachannel, I

From the above detailed description of themvention, it is believed that the construction use, and operation thereof will at once be apparent,

:and iwhlle- -cthereizis-iherein showneand described the preferredaembodimenteofatheninvention, {it'is ineverthelessto-be understoodthat minonchanges amayizbemade thereiniwithoutedepartingsfromithe gspiritzand seopesofitheiinvention as claimed 21.- A drawing xboarddattachment' zincluding "-wa {guard :strip rhavin'gta flat -.=tsurf-ace f :to engage "against one edgemfaadrawing board and having zarcurved'i'surfaceiover whibhzdraftmgzpaperezmay tr-avel'nan apron havingaa-icurved:portionzextenda ingaaround andzsp'a'ced fromvsaid-nurvedzsurfaca said' apron having aiplane portiontextendhigirom i'said curved portion to' bverlie iboard, imeans ii'or'securing said overlying portion toithetonsurpaper gu-rde portion extending-fdownwardlyzirom *Isaid :curved-portion to overlie the board, means for securing said overlying portion to the top 'sur'face of the-board, said apron having a plane p papergguideportion extending downwardly from the curved portion of the apron and across the plane of the fiat side of the strip, depending spacer ribs extending downwardly from the unz'derside -01 the =first+mentioned planeuportionof :theea-pron .tmhold the, same spacediromaaldrawe iing board t for 1 the passage-iotypaper ben eathithe apron and end webs on theaapnon ioverlyingllthe lendsloftheaguarchstrip.

- ACQUESSCHWEEEL.

' REFERENCESIG'ITED -frhesfollowing references-ware of record-Anathe -ifile=otithis *p'atent: V v

UNI TED STATES PATENTS v "Number, Y 77mm a r;

222,0 47 Holden'i v s'Novi25;;T8'l9 794,359 King "1111 11151905 3,508,470.

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