claiin as iiiy invention is: 1. A device of . the cliaracter described, coiiiprisiiig a solenoid coil.. a liead mciiibei-, a screw stein sectioii extendiii(r fi-oiii the head 25 lileiiiber, an arniature (,oi-e sectioii threaded on tl)e screw section and provided with a slot in its side, and a spi,ing pawl member in said slot and en,,acing the screw section. 2. A device of tCe character described, 30 comprising a screw stem section, a movable iiiember tlireaded on the screw section and liaving a chamber in its outer end coinmun@eating with a slot in tlle sid@ tliereof, and a length of spring in said cliamber bent With 35 one end portion extended in the.slot and engaging the screw section. 3. A device of the ebaracter described, comprising a sci-ew stem section, a movable inember threaded on the screw section and 40 havin(r a ebamber in its outer end communicat slot in the side thereof , and a g in said chamber bent in shape witli oiie ei@d port and engaging the screw sec45 tion. 4. A device of the character described, comprisinly a movable member having -a cliamber i-n one end with a threaded bore in the other end communicating therewith and 50 a slot in its side communicating with the bore ', ,t screw stem adapted, to be threaded in said bore, and a spring in said chamber bent with one end portion curved and extended in the slot and its other end portion 55 foriiied into an eye through ivhich the screw section pisses. . 5. A device of the character described, comprising a movable member havinc, a cliamber in one end with a threaded Eore 60 in the other end communicating therewith and a slot in its side communicating with the bore and the chamber, a screw stem adapted to be tlireaded in said bore, a spring in said chamber bent in substanti@lly U-shape with '65 one end portion extended in said slot and en,agin(y the screw section, and means closing the -outer end portion of said chamber. 6. A device of the character described, coinpi-ising a solenoid coil, a liead member, a stem exteiiding from the Ilead member, an 70 armature core movable upon the stem, and i-esilielit meaiis carried by the tore for engageinent w:lth the stem to hold the two in i predetermined adjusted position. T. A device of the cliaracter described, 75 comprisin(y a solenoid coil, a head member, a stem extendiiifr fi-on@ the head member, an ai-iiiatiire core iiiovable upon the stem, and - resilient iiieans carried by the core and engageable witli tlle stem foi, locking the two 80 in a I)i-ecletermined adjusted position. 8. In t control iiiechanisni, the coinbinat oii of iii -,tc'ttiating solenoid coil, a, dasliI)ot detacliibly coniiected at one end of the coil, t piston'movable witliin the dasli-pot, 85 It threaded steii-i carried by. the piston, a solenoi(I I)Ittn(,ei- receivin(y tlierein the tlii-e-@ide(I poi-tion of the stei@n, and resilient iiie,,tns (-,,ii-ried I)y tllc plti'nger and eiigageai)le witli the steiii foi- liolding the plunger go iii a I)i-edetermined position upon the stem. 9. In a coiitrol meelianism, the combination of an act,uating solenoid coil, a dash-pot detacliably connected at one.end of the coil, t@ piston movable witliin the dash-pot, a 95 threaded stem carried by the piston, a solenoid plunger movable upon the stem, and spring actuated means carried by tlle 'Dlunffer and adapted to en-age tlle stem fo@ locr@- in(r the in tivo in a predetermined adjusted 100 position. 10. In a control device, the combination of a solenoid coil, a dash-pot chamber detachably mou'nted at one end of the ecil, a piston in said chamber, longitudinal chan- 10,5 nels in the cliamber for permitting free flow of fluid past the piston during a certain portion o.f . its movement, a solenoid plunger comprising an inner section cai,ried by the piston, an- an outor section threadedly con- l@ 0 nected with the inner section and extending into the solenoid coil and lugs on the piston engaging in the channels to prevent rotation of the.piston upon adjusting rotation of the outer plunger section. 115 11. A device of the character described, comprisin(r a solenoid coil, a head member, a stem ex-tending fiom the head member, an armature cor6 movable upon the stem, and means carried by the core and movable 120 in a plane at right angles to the stem for engaoement therewith for holding the core in ,t pre(letermined position upon the stem. 12. A switch meelianism of the class described, comprising a solenoid coil, a sta- 125 tionary contact member at one side of the coil, a movable contact member formed of a single length of wire, doubled upon itself and havina its end portions I secured at the opposite side of the coil, said member being 130

resiliently urged toward, the stationary contact member, a tappet pin slidable co-axially with the coil, the intermediate portions of the wire being oppositely bowed to embrace and hold the pin and a -solenoid core slidable in the coil and en ageable with said pir.t to open the switch., 9 13. A device of the character described, comprising a solenoid coil, a head memb@r, 10 a.stem extending frobi the head member a hollow armature core movable upon the stem aiid having therein a slot, and resilient means positioned within the core and movable through the slot for engagement with 15 the stem for holding said gore in a,predeter" mi:ned position tipon the gtem. 14. An over-load relay of the character described, compris@ftg a s'olenoid doil, a head member, a screw, stem selction eitencling @ll from the head member, an armature core _pection threaded on the screw section and provided with a @ head in the side thereot, and spring means -catried bDK the armature core section and, against w ich. the screw 25 stem section works as the same is threaded into the core section. . 15. An over-load relay of the character described, comprisino,,'a frame member, a golenoid mounted in@the frame member, a 30 dash-pot chamber secured flush against one side of the frame member, a piston in the charnber, a screw sti@m extended from the, piston,, an armature into wlilch the scre-vv stem is threaded, the a @ ature being adrm 30 j iistable on -the screw stem to regulate the distance the armature projects to the solenoid when the piston is in lt normal position, sprino, means within the armature and teiisioiiing"against the screw stem as it is 40 thr'eaded thereinto, and a circuit closure mou nte.d.on the otber side of the frame member and operable upon movement of the arma ture into the solenoid. 1 6. An over-load relay of the character desc ribed, comprisino, a frame member, a 45 sole noid mounted in - the frame member, a dash pot chambei-, means detachably securing the dash-pot chamber flusli against one side of the fraine member a piston workable in the chamber, an armature 4bxtendible. 50 into the solenoid, an, adjustable connection betw een the piston and the armature wherein the distance the armature projects in the sole noid wlien the piston is in its normal inactiv e position -may be ad usted, and a cir- 55 cuit closure on the other side of the frame mem ber and operable by movement of the arma ture into the solenoid. 1 7. An over-load relay of the character desc ribed, comprising a frame member, a 00 sol6 noid mounted in. the frame member havin-@ a central boi@e, a dash-pot chamber seet;@ ed flush against one si - de of the fram6.in com munication with the solenoid bore, a pis-ton in the chambei, an armature extendible 65 into the sol6noid bore, an adjustable connecti on between the piston and armature whe reby the dash-pot chamber may be detach ed from the frftme member and the dista nce betweeii the armature and the pis- 70 ton adjusted to regulate the distance the ar mati-ire projects into the olenoid when the dash-pot chamber is secured in place ag aiiist the f@,ame memb@r, and 'a circuit clos ure mounted on the other side of the 75 from e niember and operable by movement of the armature ihto the solen6id. I n testihiony wbereof I hdreunto affix iny sign attire. GUSTAV. 0. WILMS.

Reissued Feb. I 5, 1927. Re. 16,55@l UNITED STATES PATENT OFFICE. GUSTAV, 0. WILXS, OF MILWAUIKEE, WISCONSIN, ASSIGNOR TO THE RFLIANCE COXPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN. DASHPOT-CONTROLLED SWITCH. Original application filed February 20, 1920, Serial No. 360,098, Patent No. 1,449,025, Xarch 20, 1923. Divided and applioation Illed February 26, 1923, Serial No. 621,353, Pdtent No. 1,584,063, dated Xay 11, 1926. Application for reissue filed December 15,1926. SCr4al No. 155,067. '.I'I)is'invelition relates to certain new and 11.,,,efill jinprovements in da.-h-pot @ontrolled iiiechanism and is inore particiilarly dii-ected to the provision of means for regulating or .5 coiitrolling the tinie factor in the opetation of tl)e switell fo'rming part of the mechaiiism. This application is a division of mv copending one for dash-pot controlled s-witch 10 fi.led Febrtiai@y 20, 1920, Serial No. 360,098. It is an important object of this invention to I)rovide a, switch, adapted to be opened til)on adverse conditions in the circuit in whiell the same is included, employing a 15 delay device to prevent opening of fhe eirciiit'upon a momentary or temporary 6verload and having means for readily adjusting the time factor in the operation of the switeb. 20 Another object of this invention resides in the provisioii of means p . ermitting the readv adjustment of the time factor of the switch @nd having siiitable designations tbei-e6n in which the time factor m-,iy be set 26 at any definite point. Anotlier object of this invention residesin the provision of an improved adjustable coniiection between the delay device and the armature core which is acttiated to ovei-come 30 the delay device iipon the load in the circuit inerea.sing beyond a predetermined degree. Tt is another object of this invention to simplif.y and otherwise improve the struetur@ and the convenience,with which said 36 devices may be adjusted for the various conditions of use under wbich they would be desired to op@rate. A furthei- important object resides in the provis!,ion of a dash-pot striieture having its 40 parts so arran(yed as to procure a desired proloii,!Tcd reta@Ain(y action witli an exceedin(yly short stroke nof the I piston member whereby -a desired compactness of structure' is I)rocured, and ivhereby, with respect to the 45 switch operating -,olenoid, a maximum ad.lustment of the armature core therein may be permitted, so as to provide for desired opel-ati n of the sivitch Tnechanism under a 0 wide i-ange of current conditions. A ftirtlier object, of this invention resides 50 in tlie,provision of aii inipi-oved relay struettire wlierein the dash-pot is secured flush a-aiiist the side of the solenoid frame to red@ice the ovei-all size of the relay and at the same time pei-mit the detachment of the 55 dash-pot assembly for the purpose of adjustiny the distance the armature pro'ects therecrom -%vhile the dash-pot is apart irom the relay frame. A still further obiect resides in the provi- 60 sion of an arrangement whereby the dashpot structure may be most readily connected with or disconnected from its support, to permit adjustment or inspection, and whereby, in the present structure, the armature 66 plu" ,@,er member. may be most readily adjuste to vary its'effective length and held in such adju'stinent without the use of set screws or other members requiring independent manil@tilation to permit the adjust- to ment. With the above ana other objects in view which will appear as the description proceeds, my invention resides in the novel constrticti.on, combination and arran,ernent of 75 parts substantially as bereinaft'ei@'described and more partic@larly defined by the appended claiiii , it bein@@ underst@od that suen changes in the precise- enibodiment of, the hereindis elosed invention inay be made as 80 come within the scope of the claims. In the accompanyidg drawings, I have illustrated one complete example of the physical embodiment of my invedtion constructed according to the best mode I have 8,5 so far devised for the practical application of the prineiples tliereof, and in which: Fi(rur e I is a side clevational -@Tiew of a nia@7ietic ally operated sw'tch mechanism embodying @ my invention; go Fioure @ is a vertical, longitudinal seetional view therethrough on a plane 'indicated bi, the line 2-2 of Tigure 3 - Fio, 3 is a plan view of the switch mechanism; 05 Figure 4 is a detail view of the adjtlstable connection between the al-mature core and the screw stem, said. view being partly in

section an(I partly in elevation and taken througli Figtire 2 on the plane of line 4-4, and Figure 5 is a pei-spectin,e view of the pisr) ton, somewhat enlarged, slio-%ving tliereonthe 1)orts and tlle valves therefor. Referrin(r now iiiore particularly to the di-awings, in the 1)resent embodiment of iny. invention, the various parts are carried by a lo franie forined of a metallic strap 10, bent in stibstaiitially rectangtilar sliape and pi-ovided witli attacliin@,r bolt lioles in the ends of the frame. A sol'enoid coil 11 has its coii-VeDtiODally slioivn convolutions disposed be15 tween the sides of the friiiie and wound upon a core sleeve 12, whicli has one end projected throuo,li one side of the frame to provide an annu]7ar holdiiig shoulder, tile, usual end plates 13 of the coil being engaged against, 20 the inner sides of the frame. A bushing member 14 is fitted within the other end of the cor'e sleeve and extends tlirouo,h the other side of the frame. A tapP(?t pin 15 is slidably mounted in the bushing 25 and extends through an insulating bloelc 16 disposed on the adjacent side of the frame, said side of the frame being disposed uppermost in the present ernbodiment of my invention. 30 The stationary contact member of a switch structure mounted on block 16, comprises a plate 17, see-ured on one end of the insu ating block by a binding @ost 18, the con portion of the plate being inclined 35 obli outward. The movable contact me er comprises, in the present instance, a leno,th of wire 19, doubled upon itself and having its led on a bolt 20, on 40 the remot block. TI wardly and en(rage block 16 to prevent rotation of the coil portiom on the bolt, and said wire possesses conside@rable resilience, where45 by its bent portion, constituting the free end of the movable contact member,.is resiliently ur(red toward the stationary contact plate 17, the wire lengths bein(y twisted adjacent their central bend, -,vhereby to bold a contact 60 button 22 for engagernent with the plate. The intermediate portiods of - the wire lerigths are oppositely bowed to fit the groove head portion 15' of the tappet pin 15, ivhereby outward movement of the tappet pin, 55 upon engagement by an armature core witliin the solenoid, will open the switch. This armature core of the solenoid, wbieli -%vill be later described in detail, comprises the pi-ton stein of a daq-h-pot arrangement, 60 including a cylinder 23, having an integral bottom closure and provided with a top closure plate 24, having its peripheral portion presseddownwardly and theia upwardly at its extremity, to de@ne a@fla-nge frictionally 6,5 engaging in the upper end of the eyender 23. The closui-e plate is pi,ovicied witli a central plunl,-er apei-ture and has its portions surrounaino, said aperttire depi,essed to form ii shoulde@'adapted to engage abbut the slioulder of the frame, formed in the present in'- 70 stance, by the projected end of the coro sleene 12, wliereby to propei-ly center the dasli-pot cylinder in its assembled osition. The da@ii-pot is detiiehably liels against the frame by a siiigle length of sprino-, wire, 75 bent in stibstaiitially U-shape to provide a voke 2r), and having its en&s bent iiiwardly to foi-in pintles engaged in recesses 26 in the central edge portions of the lower side of the f rame. The legs of tlle yoke are sinuous- 80 ly bent to per'mit resilient extension tbereof, and the biglit pottion of the yoke is engageable in central recesses foi-nied in a pair of ribs 27 on the bottom of'the dash-pot cyhnder, said ribs being purved to provide slide 85 sui-faces for the bight of the yol@e, and the central portioii of tlie, bight is olitwardl.Y bent betaveen its rib engaging portions to form a finger piece 28. Tb6,yoke will move from the recessed poi-tions of the ribs upoii 90 lateral pressiire on finger piec46 28, and tlius the dash-pot cylinder inay be iiiost readi@Y. assembled or disassembled with i-espect to the frame by swinging, the retaining,, yoke oi! the pivots afforded by its pintle ends. Ob The bottom of the dash-pot is provided with a plurality of upstanding annular wall sections 29, concentric with tlle wall of the dasli-pot cylinder, and a piston 30 is loosely fitted within the dash-pot cylinder and car- 100 ries a plurality of depending wall sections 31, adapted to loosely fit bet@ween the wall sections 29 and the main wall of the cylinder, said piston also carryihg a depending 105 able in the space der wall section pot chambers are walls 29, WI)icll increase vo as the p ston is drawn upwardly, and a of dasli-pot chambers are 110 defined at th tom of the walls 31, together with a third chamber defined at the bottom of the central projection 32 of the pistd'n. Intake or timing ports 33 exteiid througli 115 the piston aiid commiinicate Nvith the upper dash-pot cliai-nbers, wliile relativelv large otitlet ports 34, having check valve balls 35 tberein, are also extended tliroiigli tile I)is- 120 ton and commiinicate witli the e cliimbers, the balls being lield in place by i I)Iate 36 seciired oii the piston and bavin(r its ends p@ojecting ovei@ poi-tions of the outlet ports. A common control for tlm intalze ports ')'i3 is afforded by a timing valve plate 37, pivoted orts and liaving er the ports, said nst considerable adjust the flow capacity of the inlet ports and procur6 a 130

corresponding adjustlilent of the time inter-. val of operation of the dash-pot upon L given pull. . By reason of the loose fit between the vai-iotis wall se(!ti@)iis, iny siiitabl.e fliiid N@71iieli is provided for the dasli-pot will piss tilrougli the ports 33 iii lifting iiioveinel'it of the pisto@ and will then flow laterally iii the upper dash-pot chaiyil)ers aiid pass.be10 tween the oi)l)osed stii!faces of ilie various .wall1)oi-tioiis into the ]oAN,(@i- d,,tsliI)ot ell,,iiiibei-s ilefined by the sliding ititerfit. of the Ai-alls. A toi-tuotis I)atli is tlius affoi-ded foi, the fluid iii the retarding operatioii of the 15 dasli-p(.)t 1),ti-ts, wliei-el)y to iiiat.ei-ially incre,t,,-,e i-etai-diiig action I)y i-easoii of the iiiei-tia and iiiereased frictioi) of the fliild infollowiiig stieli toi-tuotis 1),ttlis. The inte.i-ior of the dasli-I)ot cylinder is 20 i)t,oN,ided Nvitli longitudinal cliaiiiiels 38, extendiiig froiii its top to a I)oiiit a(Ijtcent the tol)s of the- NA-all sections 31. I'Iiiis, as the I)istoii is raise(I diiring the desii-e(I t,ime iiitei-val of the detent actioii, the li)iiit. of sucli 25 intei-val will be detei,iiiiii(-,d by iiio@yeiii(-@xit of the piston wall I)oi-tions 1)@ist the tol)s of t@lie cvlindei-@wall portions, at ivliieli tiiiie fi-ee ff@w of fluid tinder the piston will be I)ei-iyiitted tlii-.ough cliaiinels 38, tlitis pei-iiiitting 30 a quick upper movenient of the I)iston -at the limit of its desii-ed detent action, to prociire the l@equii,ed operation of the piston stem. The piston is held agtinst rotatioll in the evlindei- by lugs 39, projecting froin 35 its peripheral portion -into certain of the cliannels 38, the width of said lugs being, liowever, less than the Aiidtli of the clianii(,Is, so as jiot to interfei-c witli fi-ee flow of fltiid tlii-oiigti the clitnnels iii the i-eleas(-@ a(,-tioll. Tii tli(@ pi-eseiit sti-ticttti,e, the steiii oiPILI]ICYL@l' Of the 1)istoii (!oiiipi-ises a p-,i,ir of adjustablv coniiected parts, the upper part constittiting in ai-mattii-e core en,),a,yeable in [5 :the sleeve 12, in the foi.-i-n of a cylindrical member 40. liavin(- a bore in its lower end poi,tion, tlireaded to receive a screw 41, wliieli c@,nstitutes the lower section of the 'Stem the laead of the screw being preferably ;o cast I in the pistoii body. The upper portion of tlle ai,nititure core 40 is chambered to receive a retainiii(v wire meinber 42, bent iii inverted U sliape witli the lower end portioii of one of the le(ys ftirther bent in the t, foi-iii of aii eye 43, embi@@icing the screw 41., a.nd the otliei- le@r (@xtended witbiii t loiigittidiiial slot 44., foi-iiied in the side of the cot@e iiiei)il)ei- witli i.ts lowei- eiid boni,ed iii-. w,,ii-dlv and coiistitutin(y a p,,iAi,l en(va(yeable witli ilie. screw aild adapted to.yiel@fably set in alongit.udinal groove 45 ciit in the screw,. whei-eb.y- the core iiiember is yieldably held a;@,,iinst iiiovc@iiient oii the screw, the sides of the slot -44 bracina tlie. -@vii-e . pa-%vl portion agaiiist distoi-tioii. The upper end of ilie core meniber is closed by a cap plate 46,.set cli n ' the spring within its amber and retai ing in place. The extent to which the armature core I)rojects into the coil in the initial or de- 70 pi-essed I)osition bf thp, dash-pot pluiiger ob-. v-iously deteiiiiines the @action of the dasli)Ot iyiecli.anisiii witli respect to the aiiiotint (f etii-i-ejit pi,@sing tlii-ough the coil, and tlle core iiiejiil)er iiiay tlius be'8et by adjtistment 75 oil the sci-env for the desired operatioii of disli-I)ot iiieclianisi-n at different rate8 of cut-i-ent. This adjttstiiieiit can be convenieiitly effected b@ siniply sn%rinoino, t,lie lioldin(r yol@e 25 of tlle dtisli-pot cylindei- to one 50 si(,e, to I)ei-iiiit reiiioval of the cylindei,, and tlieii gl',181)illg - Iln(I tLIl'IliDg tIlC core nieinber, tlic@ pistoti 1)@,iitg lield against the turning iiiovedielit. by its Itigs 3.(,,as desci-ibed. This adjustinent may 1)(, tliiig effected in a iliost 85 i-eady iiiand.er witliout itecessitatiiig iii,,tnipt;iation of any set screws or otliei- lioldiiig iiieiiibers anci witlioiit disturbing the inter'ior of the dasli-pot cylinder. The peril)hery of tli(@, core meiiiber is pro- 9( vided with a sel-ies of calibi-ated graduations 4,7, ivlieieb3@ it iiiay be set for proper ol)eratioii iinder given curreiit conditions, said graduations bong read froiii the edge of the plate 24. The time interval of operation of the dash-pot with respect to a given set of etirrent conditi.ons, is adjuste(I as described, by nieans of the valve plate 37, access to said plate beiiig afforded by foreing the top plate 24 from the cylinder. 100 wl)icl-i inav be i-e-adily done by i-eason of its fi-ictional - iit. The relay sti-tictul-e illustr,,Ited and described is especially applicable to switeli boards and, lieretofore, it bas been necessai-y 105 to inei-ease the overall lieigbt of the switeli boai-d panel an inch or more to accoinmodate the dash-pot and permit the adjustment of the armature and the consequeiit relyulation of the point at which the relay 110 fi@nctions. With the dash-pot reinoa,ably secitred fltish against the frame M'ember of the relav, its overall length is decreased, permiti'ing a'similar decrease in the overall Iengtli in th I e switch panel thus e@ffectin(v an 115 economy. The dash-pot beidg remova,@ic permits the location of the relay in an out of the way place on the switch board panel in,,ismiieh as the dasli pot may be readilv de120 tached and talien to a point of liglit an@l the arinature tidjusted. I liave tlit@s provided an excee(lingly coi-npact and efficient da-h-pot control meeliaiiism, whicli is of simple and dlirable con.125 struction aiid wbi@2h may be most conveniently adjusted for the various conditions of tise requir6d. The device constitiiting the present embodiment of my invention is commonly termed an overload relay switch, and in use there- 130

of, the solenoid coil 11 would be connected in series with a motor or the like, and the contact members of the device would be connected in series with the coil circuit of the main controlling switch. The dasli-pot mechanisin affords an inverse time limit on the operation of the switch, causing the actuating ai-mature core 40 to move slowly on a inild over-load and permitting its very rapid 10 movement on a serious over-load. This time Iiiiiit feature niakes it possible to set the switch so as to protect the ii@otor against bona fide, dangerous over-load and yet prevent operation of the savitch and conse15 quent stoppiiig of tiie motor incidental to d coiiditions, tlle iteli also servin(y iiig the relatively sai-y in startin,r. 20 a iiiotor. zn What I