Патент USA US2404949код для вставки
July 30, 1946. ` H_ L_ DE LlSLE 2,404,949 ADJUSTABLE DRAFTING STAND Filed Sept. 17, 1942 È* / »È JAW-Í 5 Sheets-Sheet 2 (müll l Hâeolß ¿1. P50516 DICE/9550 nu L/,sw H Maemyf/rfcame July 30, 1946. H_ L_ DE LlsLE ' 2,404,949 ADJUSTABLE DRAFTING STAND Filed Sept. 17, 1942 fyi 7j@ f@ 0" 75 7] 3 Sheets-Sheet 5 77 73 76 76:6 43 ag. Patented July 30, 1946 2,404,949 UNITED STATES PATENT OFFICE 2,404,949 ADJUSTABLE DRAFTIN G STAND Harold L. De Lisle, deceased, late of Sheboygan, Wis., by William H. Murphy, executor, Chicago, Ill. Application September 17, 1942, Serial No. 458,634 10 Claims. l This invention relates to adjustable drafting stands of the class in which the drawing board is adjustable both vertically and angularly and. more particularly, of the type wherein the dra-v - ing board is maintained in its adjusted inclined position by friction, and, in its adjusted vertical position, is balanced by a spring adapted to be adjusted to exert a controllable tension. Among other objects, the present invention (Cl. 45-131) 2 supporting structure for the board. The top I2 of the table may be used as one working surface, accessible from one side of the table I0, which is here referred to as the rear side, namely the side opposite that at which the drawing board I I is pivoted as next described. The drawing board I I provides another working surface in the usual way. In accordance with the present invention, the aims to provide an improved and simpliñed con~ il) table ID at its ~front side carries for simultaneous struction of this type including a novel gripping vertical adjustment, as later more particularly ex mechanism for the inclination of the drawing board which may be released by a manual move plained, a pair of hollow posts I9 and l2|) having their free lower ends 2I slidingly passed through ment by the draftsman, and, similarly, novel ten a casing 22 carried at the front of the desk I il sion means for the vertical adjustment of the 15 by and between the legs I3 and I4 thereof. rI'his board which» may be operated by a movement of the foot through a pedal device. These and other objects and advantages will be casing is here shown of about the width of the legs and extending vertically thereof about one third of the height of the legs, but preferably a little nearer their tops than their feet. Bolts 23 apparent from the following description, taken together with the accompanying drawings, in 20 may so secure the casing to the legs I3 and I 4. It which_ will be noted that the table top I2 terminates at Figure 1 is an end elevational view of a drafting the front of the table adjacent the posts I9 and stand embodying the present invention, showing in full lines an inclined selected position of the 2B short of the legs I3 and I4 so as to accommo date the posts in the plane of the legs. drawing board, and, inbroken lines, a horizontal 25 Adjacent their tops, there is shown pivoted to position thereof; each of the vertically movable posts I9 and 20, Figure 2 is an enlarged front elevational View as at 24, a yoke-like or inverted U-shaped` bracket of the structure of Fig. 1, parts being cut away for 25, which as best shown in Fig. 4, may be formed clearness of description; f or” two angular sector-shape plates 25a and 25h Figure 3 is an enlarged partial cross-section having their flanges welded together as at 2G, one taken on the line 3_3 of Fig. 2, and also being a similar section on the line 3_3 of Fig. 4; Figure 4 is a fragmentary view on the scale of of the latter being extended as at 21 to be secured as by screws 28 to the under face of the drawing board I I, the board and brackets being reinforced Fig. 3 of the left-hand side of Fig. 2‘ but with parts adjacent thereto by the cross-cleats 29 also on in cross-section taken on the line 4_4 of Fig. 3; 35 the under face of the board. Figure 5 is an enlarged partial plan View taken With the drawing board so arranged for angu on the line 5_5 of Fig. 2; lar movement on the pivots 24, frictiona1 or grip Figure 6 is a similar View taken on the line 6_6 ping means are provided for holding the board at of Fig. 2; a selected angular adjustment whereby the board Figure 7 is a partial vertical section on the scale 40 may be disposed either vertically or horizontally of Fig. 5, taken on the line 1_1 of Fig. 5; or at any intermediate angle therebetween. For Figure 8 is a. similar View taken on the line 8_8 this purpose, there is shown secured to each of of Fig. 6; and> the posts i9 and 2Q, between the plates 25a and Figure 9 is a detail section taken on the line `25h of each of the yoke-like brackets 25 respec 9_9 of Fig. 2 somewhat enlarged. 45 tively, a segment plate 33 along the arcuate pe Referring in detail to the illustrative construe riphery of which is suitably secured an arch rail tlon shown in the drawings, the numeral I9 in 3! having corrugations thereon, as by the screw dicates in general a base for the drawing board threads 32. A frictional mating member such as indicated generally by the numeral l I. The base the half-nut 33 rides on each of the arch rails 3l, III may be in the form of a table or desk having 50 the half-nut 3_3 beine, here shown secured between a working top I2, front legs I3 and I4 and rear the sides of an inverted channel bar 34. The legs I5. The table may be reinforced along its. threads in the half-nut mesh with the screw top ends by panels I6 and along its lower ends by threads 32 on the arch rails, the bracket ‘25 also cross-pieces I'I, the latter being connected by a straddling the channel bar 34. longitudinal runner I8, thus providing a suitable 55 Each of the channel bars 34 is secured to a 2,404,949 3 ñnger 35 which is keyed to a rock shaft 39 jour nalled at each end in the cleats 29, the ends oi the rock shaft 35 which pass through the cleats and through the iingers 35 being conveniently reduced, as best shown in Fig. fl, to prevent longi tudinal movement of the rock shaft. Between each of the inverted channel bars 34 and the flanges 26 of the brackets 25 is inserted a com pression coil spring 31. which normally biases the channel bars 34 into position to cause the grip ping members 33 to frictionally engage the arch rails 3I, and, in this instance, to intermesh the threads 33a on the half-nut 33 with the threads 32. One of the inverted channel members 34, in this instance the one at the left-hand end of the drawing board is conveniently extended out wardly as at 38 to form a hand lever by which the common rock shaft 3S may be partially ro 4 trained, and thence the cable 46 travels from the pulley 41 with the cable 45, to the coil spring 49 where it is also connected, as at 59, to the coil spring. The spindle 53 has its bearing in the casing walls advantageously reinforced by ex tensions 55h of the uprights 55. Tension on the spring 49 may be varied by means of a crank 55 on the exterior of the casing which is keyed to the spindle 53, as at 51, and has a handle 58. By rotating the crank 5B in a clockwise direction, looking at Fig. 2, the ten sion of the spring 49 may be increased and by turning the crank counter-clockwise, the tension may be decreased. The face of the casing may have radially arranged holes 59 therein into which a nib Bil at the inner end of the handle 58 may be sprung to hold the crank in selected adjusted positions against the pull of the spring 49. The handle 58 may be constructed as shown in Fig. 9 tated against the action of the springs 31 to re lease the gripping members 33 from the arch 20 in which the nib 50 is shown integral with a spring plunger 69a threadedly connected as at rails 3l and thus permit angular adjustment oi 59h with the exterior shell 69o of the handle, the drawing board, as suggested in Fig. l. A coil spring 99d surrounds the plunger 60a and The end of the lever 38 may terminate in a presses at one end against the flange 99e of the wooden handle 39 for convenience in grasping this lever and moving it toward the board to 25 plunger 69a and at its other end `against the crimped endlßßf of a spring barrel 99g. By pull effect the release just described. Upon letting go ing outwardly on the exterior shell 90C of the of the lever 38, the springs 31 again urge the handle, the nib is retracted, the spring being fur gripping members 33 into engagement with the ther compressed, so as to be again urged toward arch rails 3l to retain the board in its selected angular position until its position is again de 30 the face of the casing upon release of the handle. Thus the entire weight of the posts I9 and 2D sired to be changed. Stop members 49 carried and with them the drawing board II and its at the top of the posts I9 and 20 limit backward langular adjustment mechanism may be counter rotative movement of the pivot brackets 25 on balanced by the spring 49. In practice, almost the posts to inhibit rotation of the drawing board the entire weight is counterbalanced so that ver in this direction beyond the horizontal position tical adjustment of the drawing board may be as shown in broken lines in Fig. l, and other stops effected by relatively slight manual effort on the 4I at the lower ends of the arch rails 3| may part of the draftsman, to raise or lower the draw~ limit the rotation of the drawing board in the ing board as desired. A brake mechanism, as opposite direction, by also contacting with the 40 next described, is provided to maintain the board pivot brackets 25. in such selected vertical adjustment. Turning now to the means for eiîecting the Following the present invention, the brake vertical adjustment of the drawing board, and mechanism just referred to comprises, as here further in accordance with the present invention, shown, a pair of jaws 6I and G2 which, by their the casing 22 receives the posts I9 and 2U there somewhat wedge-shape mouths IDI), partially through by means of apertures 42 and 43 in the receiving the posts i9 and 20 respectively, are upper and lower walls respectively of the casing, arranged to jam. the posts between themselves these apertures affording a sliding fit for the and the opposite margins of the casing apertures posts therein. Aflixed to each of the free ends 42 and 43 and thus to frictionally clamp the posts 2| of the posts, as at 44, are flexible members such as, in this instance, the cable 45 for the post I9 50 against vertical movement therein. The jaws 6I and 52 are shown carried integrally at the upper and the cable 46 for the post 2U. These cables ends of bifurcated arms 93 and 54 respectively. run upwardly parallel with the posts and into the The arm 93 is conveniently pivoted on the pivot casing 22 where they are supported as next de 55 of the idler pulley 41 and the arm 64 is piv scribed. It will be noted that the openings 43 oted similarly on the pivot 65 of the idler pulley in the lower wall of the casing are enlarged suf~ 54. Loosely connected to the jaw El, as by a ñciently to pass the cables therethrough with the somewhat ball and socket connection, is a short posts, the cables being here shown upon the out cylindrical hollow bar` 51, a nib Gla on the jaw side of the posts in contact therewith. projecting into the interior of the bar, and con The cable 45 for the post I9 in this instance nected to the jaw 62 is a similar hollow bar 68 passes over an idler pulley 41 journalled within which has a relatively long extensible section 59. A nib 62a on the jaw 62 projects loosely into the interior of the bar 68. These bars may be conveniently in the form of pipes or tubing. The bar sections 53 and 69 are left and right-hand 59. The other end of this expansion coil spring threaded as at 98a and 69a respectively lwhere is hooked as at 5I to a cord 52, the other end of they are connected by a threaded coupling 13 by which is wound on a spindle 53 journalled within which the combined length of the bar sections 68 the casing 22 adjacent its end opposite the post and 59 may be shortened or lengthened. I9. The cable 48 for the post 29 passes upwardly Adjacent the left-hand end of the casing 22, into the casing 22 similarly to the cable 45 and 70 in this instance, the uprights 48 are extended as over an idler pulley 54 journalled within the cas at 1I to provide a bearing as at 12 for a pintle ing on uprights 55 riveted as at 55a to the inner 13 extending across the casing. Upon the pintle faces of the casing. The cable 45 thence travels 'I3 is pivoted centrally a pair of parallel brake longitudinally of the casing 22 to pass over the links 14 and 14a. The links 14 and 14a are ex same pulley 41 upon which the cable 45 is en the casing on a pair of uprights -48 riveted as at 48a to the inner faces of the casing, and thence to one end of a relatively heavy expansion coil spring 49, to which the cable 45 is hooked as at f5 .2,404,949 6 tended .in :opposite .i-.directions :from their »pivot 11.3. Theotherwisefree ends .of the bars .61 :and spring, ,the spring 4.9 being thus what .is com« .69 are pivotedlas 'at .l5 .and :1_6 respectively .to `the adjacent .ends .of »the .brake rlinks 1A -and l14d. The >link 'I4 iis ,further „extended -in `both Idirec. tions of ythe »pivot v'13, in one 4direction .as at 'H lto `»have hooked thereto as at -18 va wire »lâ y.which It is `to .be .understood that the invention isnot intended .to .be limited to .details -of „construction here .shown `for `illustrative purposes. 'Other .modiñcations will ysuggest vthemselves to :those skilled inthe art and having y,the ,benefit of ,the vpresentdisclosure. Furthermore, it is notintend `ed Íthat it be .understood that .allffeatures `of .the _present disclosure must .be used .conjointly, :since 'it will lbe apparent to workers in »the .art .that various combinations .or l.sub-combinations may has its other end hooked as at 80 to an expan :sion -coilrspringanchored as vat 82 to a .clip 83, monlylknownas ñoating. Weldedfas `at `84 fto -the lower wall .of the casing, The 1extremity of fthe extension 'L1 of .theilink M may be »offset »outwardlyfas at i85 to :be fclear `of :the bar »69. The .otheren’d `86-of the .link ‘L4 _has >at .times he »advantageously employed. articulated therewith as v:at ,8.7! a ~wire rod »8B which .extends :downwardly `throueha slot .89 in _ `claimed is.: ,the'lower «wall of:»the».oafsing»to .be articulated as ¿at .90 mithra .-foot lever or ¿pedal 9| gplvoted as at ï92 `on "an ¿inverted Ueshape bracket 93 suitably ’ ‘The invention having ‘been described, .what ¿is ’ l. In _a drafting ¿standjincluding ,a pair .of ver ;tically movable pests, the combination including, a Acasing having spaced apertures, said posts pass fsecured .tothe Aunder face of the .desk ,runner v|23. A.ing .through `the apertures andslidable with re Since »in the .normal gposition '.-o’f vthe bars (Sl .20 spect vto ,the casing, a ,pair of >>brake members and«69,.a line connecting .the >-pivots T5 -and 'f6 «of .the bars .61 »and >69 yon .the .links V'M_-'lila ris îsub zstantially .aligned with atheaxesfof .these bars, .the .bars vare .at substantially their «maximum dista-nce apart andthe «jaws 6l .and >.62 are `pressed ‘out wardly toclamp »the posts @I9 yand .20 -respectively .against vertical movement. When, now, the .pedal :9| depressed, the rod »88 Ais reciprocated 'hinged in .the .casing and ,adapted ,to ïrìctionally .engage the .posts .to clamp :them .against _move ment, a pair .of .aligned movable .bars supported within `the casing .by Asaid 'brakemembers .respec , .-tively, a link intermediallypivoted in _the casing Iand _articulated ait Aeach end with lsaid 'bars `re spectively, a spring anchored in said casing, means connecting ,the spring and link, said spring rdownlwardlyand the »brake links .T4-14a Iare .fro means urging ,thelink in .a direction `to press the «tated counter-clockwise‘on‘their pivot ‘lf2 against :the force .of .the fexpansion spring ill. Rotation Abars .apart whereby to urge _the ybrake Vmembers yof _the fbrake links .draws :the ends of the .bars 51 .and ‘69 ätoward‘each other or at least toward Sinto frictional engagement with said ,postsand a manually `operable lever secured ¿tosaidllink .in said casing and adapted `to rotate theïlinkin ,the .opposite direction ,against the force of said spring .a .-verticalline passingsthrough‘the pivot l2, thus `reduoingthe overallflength of the -barsrBiL-Bê-ES .35 tofreleaselthebrakemembers. ,anjdrelaxing the pressure Íof Íthe jaws 6I and `62 ’2. In 'a ydrafting-.stand of the .type .comprising on the posts I9 and 20 respectively. This move a'base .and apaîr'of vertically reciprocable spaced ment ‘need be -only very slight and the --articu .apart `upright .members .adjustably .supporting a lated connections provided by the -nibs 64a .and .drawing board on .the base, the combination ,in '62a I(somewhat .in the »nature -of universal joints) 40 cluding, .a ycasing .having `spaced apertures ,in .with :the bars .accommodate -this »movement ol’ which .said .upright members .are yslidably .ar :the îbrakelinks. 'Thereimay .beat the l>same time ranged, a vpair .of .brake vmembers hinged .in the .a ¿slight ¿inward movement toward -each :other ,casing «andadaptedto frictionally engage the .up« of :the _arms 93 and >64 on theirpivotsûä :and -6ß .right members yand îpress ,them «against the :sides Yduring 'the icontractual <movement :of the bars of -the .casing rapertures „to v1clamp them against dust .-described. lThus, l¿the ~¿posts :I'S "and 2i! .are movement, a pair .of .aligned Amovable vbars _en released for 'vertical Imovement :andare Arendered gaging »said `brake .members respectively, a :link subjcctito .theipullïof ‘thespring ‘4.9, and counter intermedially pivoted -in -the .casing _and «articu -balanced thereby, so that :the :drawing `'board lated at each end with said bars respectively, may be either depressed or elevated by alight 50 spring lmeans `connected to 'the link, :said spring pressure iolD ith‘e hand. Thereupon the pedal s! -means urging thelink in `.a rotative direction to may :be .released aand the "drawing board .again «urge the `bars whereby ,to -urge the brake secured at its desired elevation. The extension members into-clamping engagement with-’said .up 1| carries a brake stop lug 'Ha Iwhich limits right members, and a manually operable lever clockwise rotation of the links 'i4--14a under the 55 secured to said link in said casing and adapted influence of the expansion spring 8l to a point to rotate the link in the opposite direction against where a line connecting the pivots ‘I5 and 'I6 is the force of said spring to release the brake mem substantially coincident with the axis of thebars bers. (il-«69. The stop lug 'Ha acts by engagement 3. In a drafting stand of the type including a With the extension 86 of the link 14. 60 base and a pair of upright spaced apart members Intermediate the casing 22, the bar 69 may vertically reciprocable relative to the base, the carry a pair of wooden hangers 94 and 95 some combination including, a casing having spaced what loosely thereon. The hanger 94 at its lower apertures in which said members are slidably ar end has a pair of vertically spaced apart screws ranged, friction brake means in and cooperating 96 between which and between the open sides with said casing to hold the members in vertically of the hanger pass the cables 45 and 46, thus adjusted positions relative to said casing, said providing a guide for these cables. Similarly, brake means including a pair of movable friction the hanger 95 has a pair of vertically spaced pieces located between the members and engage apart screws 91 between which and between the able with the members, and means for ,simul open sides of this hanger slidingly passes the 70 taneously and selectively drawing the friction cord 52 to guide this cord in its movement. The pieces together to effect disengagement thereof hangers 94 and 95 also assist in maintaining the from the members and moving them apart to spring 49 in transverse position in the casing but eifect engagement thereof with the members. are adapted to slide on the bar 69 to accommo 4. The structure of claim 2 wherein the com date longitudinal expansion or contraction of the 75 bined length of the bars is adjustable. 2,404,949 7 8 members, said spring and the toggle means for the brake members, said apertures having sides cooperating with said brake members when ,the 5. The structure of claim 2 wherein the brake members are loosely connected to the bars re spectively by a ball and socket connection. latter are moved away from each other into fric 6. In a drafting stand of the type including a tional engagement with said board supporting base, a pair of upright spaced apart members ver 'tically reciprocable on the base, and a drawing members for holding the board supporting mem bers and the drawing board in vertically adjusted board supported by said members, the. combina position. tion including, a casing mounted on the base and 9. In a drafting stand, a base, a casing mounted on said base and having horizontally spaced aper "having a pair of spaced apart apertures movably receiving the upright members, and friction brake tures therein, a pair of board supporting mem mechanism located within said casing for hold bers slidably arranged in spaced upright posi -ing said upright members in adjusted vertical tions for vertically reciprocable movement in said positions, said brake mechanism including a pair apertures, a drawing board mounted on said of movable friction pieces pivotally mounted in said casing, between the members and engageable 15 board supporting members at the vupper ends thereof, means connected to said board support with the members, and mechanism including ing members and said casing for urging said means operable from the exterior of the casing board supporting members and said drawing for selectivelydrawing the friction pieces to board upwardly, a pair of brake members each gether to effect disengagement thereof from the upright members and moving them apart to effect 20 movably mounted in said casing adjacent one of said board supporting members for movement engagement thereof with the members. from and to engagement therewith, said brake ` 7. In a drafting stand, a base structure, a pair members being frictionally engageable with said of board supporting members slidably supported board supporting members when the brake mem in horizontally spaced` relationship for vertically reciprocable movement on and relative to said 25 bers are spread apa-rt and disengageable there from when moved toward each other, toggle base' structure, a drawing board mounted on said means including a spring supported in said casing board supporting members at the upper ends between said brake members and resiliently urg thereof, means including a spring connected to ing them apart into frictional engagement with said base structure and both of said board sup the respective board supporting members for porting members for urging said board supporting holding said board supporting members and members and said drawing board upwardly, a'pair drawing board in vertically adjusted positions of brake members each movably secured to said relative to said casing, and manually operable base structure adjacent one of said board sup means for operating the last said means to move porting members for movement toward each other said brake members toward each other out of and away from the respective board supporting holding engagement with said board supporting members and for movement away from each members. y other toward the respective board supporting l0. A friction brake mechanism for holding in members, said 'brake members being frictionally selected vertical adjustment a pair of spaced engageable with said board supporting members apart members supporting a drafting board for when moved away from each other and disen 40 vertical movement on a base, said brake mech gageable from said board supporting members anism including a pair of movable friction pieces when'moved toward each other, and toggle means pivotally mounted on the base and engageable mounted on the base structure and intercon with the members when said friction pieces are necting said brake members for moving the latter moved apart and disengageable therefrom when toward each other to disengage the same from drawn together, and means including a single said board supporting members and for moving cable connection and a single cam actuated said brake members away from each other into through said connection for simultaneously draw frictional engagement with said board supporting ing the friction pieces together or moving them members. Y 8. I_n a drafting stand as set forth in claim ‘7 50 a casing carried by said base structure, having spaced apertures in which said board supporting members are slidably arranged and housing said apart. ` . - ' WILLIAM H. MURPHY. Executor of the Estate of Harold L. DeLisZe, De ceased.