Magnetic chuck

Abstract

Claims

H, E. MoRToN` MAGNETIC CHUCK 1921 5 Sheets-Sheet 1 Filed -OCL 14'. H. E. M oRToN i MAGNETIC CHUCK Filed Oct. 14 1921 3 Sheets-Sheet 2 at ognuld Q ct. 23, 192,3. l H. E, MoRToN Filed oct. 14, 1921" s sheets-sheen, S lllllll HENRY n. Meeren, or MUsnnGoN, MICHIGAN. Y MAGNETIC CHUCK. .Application filed (ictober 14, 1&21. `.Seria1No.if507,82Q; f To all whomtt may i' Be it known that-l,HnNRYfErMoRTorT, a citizen of the United States 'of America, residing at llfluskegon,` in the l county l of i Muskegon and State ot Michigamhave in-` `vented certain new and useful improvements in Magnetic-Chucks,eof which; the following yis a speeiiicatiomareferencey bef` ing had thereinto the accompanying draw-` `ings. l Y f y In the construction ot magnetic chucks the magnetic face ot thechuck is made'up of a plurality of sections which are insulated, oneitrom another, and each yconnected with a magnetic coil, saidcoils being positive and negative coils alternately arranged,so that a piece of work placed upon vthis face and bridging the gap will be held magneti@r cally in place thereon. l l The so called air gap'of such chuck -taces is usually arranged s0 that the work. will bridge a major portion thereof, the pieces ofthe work extending transversely of the portions ot the. gap which are of greatest length, but in every known instance,l the short connecting-'portions of the gap extend in such relation to the longer portions, that atv certain points, small pieces -o .workj if arranged in normal position relative Vto Vthe, longer portions of the gap would'lie directly over thesev short connecting portionsfand would notv etfectuallyv bridge the; gap and be securelyheld magnetically.- i It is an object of this invention to provide .a magnetic chuck of extended .tace area which will effectually hold a large number of comparatively small pieces of work as well as work covering the entire or a large portion Ot the face, the air gap otsaid tace Y. being so arranged that none of a pluralityl ot' small` piecesv of work, if placed 'thereon in normal position, will come directly over throughout its length, any portionot the gap withoutbridging the 4saine and will therefore bereifectually held.: y AA further object is to provide clamping means adapted to cooperate with such magnetic means for holdingthework in place upon said tace Vwith suiiicient- `security to permit of forming the work by meansof` a suitable tool projected across thejworkfparallelwith said face. l lt is: also an object tol provide` certain other new anduseful features.A which make ing ya large 'number of small .pieces work the ydevice kparticularly adaptablel `for hold,-y and increase its utility. s A WVith the above .a ed out in the v'appended claims, reference being had.: to` the accompanying drawingsyin which- Figure. l is aplan k*view of a chuck ,illustrative of the invention;` n y Fig. 2, a side elevation ot the same with portions broken away and'in sectionto more clearly show theconstru'ction; p ed' @attentati View, the inventionconsists inthe matters herein.-A n Vvafter vset forth. and more particularly point- Fig. 3' is an enlarged planview or" the Chuck with portionsbroken away to shorten tlievigure and showing a large vnumber of smallv pieces otwork held in place on the face ofthe chuck; l Y Fig-4 isa transverseverticali section through Fig. 3, and 3 Figo is a perspective yview illustrativeY of a form of work :adapted to be held by the chuckandalso 'showing in perspective, suitable end iillerblocks kfon-'assisting in holding thework.` y f l i p While a deviceof a particular form and arrangement isy illustrated inthe drawings, ly illustrativeof the invention andi-that the construction V may',y bek modifiedy ywithin#L the scope fot they appended claims' to suit' the workin hand. I pieces of work aswell as largev piecesfso that the chuckmay be used in connection-with a planer, draw cut shapenor other large metal :working machine to :hold a 'large number or small pieces in such a mannerthatf they may vit kwill be understoodgthatthe same is'meref l .which will hold a large number/ot small all be formed .bythe vcutting tool as though they were but a single piece andtlius-greatly facilitate the operation ofmilling, planing, or'otherwise forming Small metal Apieces where it is desired to shapev alarge number magnetic means for hold-ingl suchl small K pieces ofthe work so vthat/,these pieces .may 4be tightly and accurately clampedv together in-a .row or series of rowssojthat' thecut f ting tool may be projected across all of the pieces of each row as though there were but a single piece, and further it is desirable that this clamping means be such that it cesses in the usual manner. will hold firmly a large number of small pieces to be given any desired form, such for instance as the irregular form shown in Fig. 5, which is merely illustrative ot the kind of work which is adapted t0 be held,y by a chuck embodyingthe invention. Magnetic chucks commonly comprise a body or holder which is recessed to receive a'magnetic chuck body 'containing the several magnetic coils, and as illustrated in the `drawings such a body or holder is indicated 'by the numeral l, said body being faced off on its lower side to seat upon `the table or other part of the. metal working machine to which the chuck isladapted to be secured in use,Y said body being provided with the `usual flanged recess 2 in its lower side by means of" which'the body may beheld by bolts or l other means engaging these re- In the upper` side of the body is formed a rectangular recessy to receive the usual rectangular 'casing 8 of the magnetic chuck, proper, said casing fitting snugly within the recess and containing a plurality of magneticgcoils Llarranged in transverse and Vlongitudinal rows, said coils being positive andrnegative coils preferably arranged in 'alternate relation in both ktransverseand longitudinal rows. The inagnetic face of the chuck or the face upon `which the ywork is kadapted to rest, is made up of a plurality ofv pole. piecesor plates 5, there being a pole piece'or'plate for each coil carried by or electrically connected to the core of the coil in the usual manner, and these several pole plates are insulatedv one 'from another, to providewhat is commonly known as the air gap which is adapted to be bridged by the work placed upon` this face of the chuck so that theinagnetic lines of force may pass from a positive to an vadjacent negativeinagiiet through the work .geo ves and'thus hold it firmly in place upon the chuck face.rk This gap comprises longitudinal portions extending from end to endf'of the chuck face between the several longi-y tudinal rows ot the face plates o, andalso cross connecting portions G connecting the several longitudinal portions 7 between the tudinal rows with each Vpiece extending transversely -eta long run 7 of the air -ga-p. If the cross connecting portions of the Vair gap be at V'right angles to the longitudinal portions as is the common arrangement, certain of the pieces of' work which come over the cross connecting portions of the air gap would not bridge such gap and be securely held by magnetic force, and therefore when the forming tool is projected across the several pieces ot work such pieces which are not securely held would be displaced andthe wliole row thus disintegrated. It` is therefore essential that every small piece of work be held down by the maximum-,strength off the magnets, and to insure such bridging of the gap by the. work and 'the full holding force oif the magnets thereon, the transverse connecting portions G of the gap are extended between'. the longitudinal portions 7 ina diagonal direction, ythat is, adirection other than at right angies to the longitudinal portions of the gap. When the gap is thus constructed there will be no place throughout its length where a small piece ot work may be laid thereon at right` angles thereto and come directly over another porti-on of the gap withouteffectually bridging the gap between adjacent magnets.` An essential 'feature opt this invention is therefore the arrangement of the air gap with portions of the gap which are of lesser length extending at other than right angles to those portions which' are oi greater length. As illustrated in Fig. 2 this air gap between the several pole pieces ,5 may be liled with anysuit-:ible insulating material indicated at 9 to provide a smooth continuous face r4for the chuck upon which the work is adapted to be placed. Suitable electrical connections (not shown) are provided v:for supplying current to the several coils and suitable means, also not showin-is provided for controlling 'the current,fall arranged in an-old and well knowny manner. , Suitable clamping means is carried by the body l tor vclamp the work Yso that the sevreral small pieces will be brought into and held in Iirmf contact with each other. This clamping means comprising end filler blocks l() and ll adapted to engage the ends ot the longitudinal rows of' the pieces of work S, and similar side iiller blocks l2 and 13 are provided to engage the rows laterally, intermediate filler strips lil being provided between the rows where the pieces of work are ot such a length that such strips become necessary in order to space the rows apart, that these pieces may be located directly over the longitudinal portion 'T ot' the air gap. Carried by a flange on one end of the body l is a series oit set screws l5 engaging screw-threaded openings in the flange and extending therethrough into engagement with the end filler block l0. The opposite end ofl the body l is provided with an upstanding flange or rib 16 forming an abutment for the end yfille-i' block l1 and the insol Aller block into engagement with the abutment, the tendency of this force will 'be to cause the filler block'll to more closely engage the face of the chuck, and in a like f manner the ller block12 is formed to engage the undercut side 18 of an. abutment 19 secured to the longitudinal side edge of the body 1, and the opposing side iiller block 13 is engaged by clamping screws 20 passing through screw-threaded openings in suitable bosses 21 providedupon that side of the body. The several filler blocks may be of anyV desired thickness but must be cut away along their edges which engage the work so that these blocks will not interfere with the cutting tool in forming the work. As illustrated in Fig. 5 the end filler blocks 10 and 11 may have formed ends to conform to the particular irregular shape into which the work is to be formed so that any upstanding portion of the work will be properly supported by these formed end portions of the blocks. These blocks are also out away as at 22 between their formed end portions 23 and the outer ends of the blocks to provide clearance for the tool and for the chips of the metal cut from the work by the tool. .f By the use of the magnetic chuck described, a very large number of small pieces of metal may be held in place by the chuck and simultaneously formed by a cutting tool. These small pieces of work may be arranged side by side in one or more longitudinal rows each row extending longitudinally of a longitudinal portion 7 of the air gap and bridging the gap. In operation, after a row or rows of pieces of work have been prop-- erly positioned upon the face of the chuck the current is turned on and these pieces are drawn into firm contact with they face of the chuck. The end and side filler blocks are then moved to clamp the rows both longitudinally and transversely, thus moving the several pieces into firm contact with Vone an'- other while they are being held magnetically. The accurate positioning of these ysmall pieces of work is therefore quickly secured, all being first drawndown evenly into firm contact with the face of the chuck and then clamped both longitudinally and transversely to accurately align them and to assist in holding them in place while being formed by the machine tool. Y Obviously, changes may be made in the l form of clampingmeans, the size and proportion of the parts kor the shape and details of construction of the chuck within the scope of the appended claims, without departing from the spiritk ofthe .inventiomand 'I do vnot ,therefore limitmyselfto the par@`- ticular formor arrangement shown. y kIlVhat I claimzist-fYY Q .L 1.V Ina magnetic chuck, hecombination of axplurality ofelectro-magnets, and a plurality of gpole pieces, .one foreach magnet, andftogether vforming the vwork engaging surfaceof the chuck, said piecesbeing arranged in yspaced relation to ,-form.y an vinsuwith'4 portions of the f gap extending longitudinallyof the face and transverse portions connecting the -longitudinal portions, said connecting portions extending in a direction `'15 g. lating gap surrounding allofisaid pieces f other than at right angles to thel longitudinal portions. 2. In a magnetic chuck the combination of a plurality of electro-magnets, and a plurality of oblong pole pieces, together form` ying the work engaging face of thechuck, said pole pieces being insulated one from another and arranged in parallel rows extending longitudinallyk of the chuck face with portions of theinsulating gap extendexsV ing longitudinally of the chuck and crossconnecting portions at the ends of said pole pieces extending in a direction other than at right angles to the longitudinal extending portions of the gap. f 3.'In a magnetic chuck, the combinationy of a chuck body, a plurality of electro-magnets in said body, a pole piece for eachk elec-` tro-magnet, said pole pieces together forming the work engaging face of the chuck and said pole pieces being insulated from one 'another and arranged in longitudinal rows, iiller blocks to engage the work upon the face vof the chuck and'held in contact with said face by said electro-magnets, and means carried by the chuck body for moving the filler blocks to clamp the work. c Ll. In a magnetic chuck, the combination of a chuck body, a plurality of electro-magnets in the chuck body, an oblong pole piece foreach electro-magnet, said pole pieces together'forming the work engaging face of the chuck, said pole pieces being arrangedin longitudinal rows with an insulatingy gap surrounding each pole piece, theportions of the gap at each side of the pole piecesextending longitudinally of the chuck face Vwith the connecting portions of the gap at the ends of the pole pieces extending in ya direction other than atrightangles to the longitudinal portions, side and end filler blocks to engage the work on the chuck face, l ' formedinner edges to engage the work upon fspaced'relation. in rows extending longitu-A dinally and transversely otfthe Chuck, said Vplates together forming the work engaging face of the chuck, and insulated from lone another, forming a? gap surrounding each plate, the portions of the `gap between the f, ends of the plates extending-in a direction. other than at right angles to the portions 'o the gap between the longitudinal rows of plates, vside and end .iller blocks having the .face of' the chuein' abutmentson the y y y HENRY E. MoRToN, Vitnesses: i ANNA M. Dorm, *LEWIS E.- FLANDERS.

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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    US-2483697-AOctober 04, 1949John E GilesClamping device
    US-2635754-AApril 21, 1953Donald E StemMagnetic plate
    US-4453704-AJune 12, 1984Wlajko MihicApparatus for retaining blanks in working machines