[1]May 26, 19'-@@5. 19539,543 UNITED STATES PATENT OFFICE. -IINI, Or, SPRING!,'--, @-@LD, @-IASSACYLUSETTS, ASSIGNOR. or, ONE-FOURTH illoBillill@@, CECC, TO GEORGE R. CRON-rx, OF SPRIIZCxl,'IELD, llTASSACHUSDTTS. PROTRACTOI@', LEVEL. 7'o cj77 7o7tol@)?, I"t it k,@io-, 1, PtO:-!:RT Cl'-ICCII.T@NI. ,I ol' the UII;4-eci Stites of inerica, t o' Spri-tip,@iqeld, ii-i 'Llie coiiii,,y c,,f St,,t'Le of Mass@icl-l-L,,Set'Ls, I,aN-e i,qveiitecl a iiew ,li-id usefi-.l Proti-actor Cf @vliieli the is a specificatioi-i. ?%ffy in@,e.-f,,,tiori relatec; to il@ll@iroveiileilts iii 10 in Nvliieli proti,,,tctoi-,g Iiicl Spii-it i(@:vels ai-e co@- @ibliied, ,iiid consi@,ts ossentially ol, ,I liti@Iii,@0, i-isi-tig t@iere'Lrom, i L)[,.otl!:"(,t,)r pivot,@,!".Iy (!")-iiiiec-tecl iviti-i siicl i,'@lly to seelir(, s,,tid pro15 to sai(I s,,ij)p,-rt i.ifL-@@r the foi,iiier liif, oii its piv,)'-, a ',)(,ai-,-l iiaoiiiit(@cl aj@)ove l@,,;d on sticl piN-o4L, ,teLitst,il,le -@teans 'i)et-,veen sai(I I)roti-a(@.to,r tnd beaj-,i, a @;p'li-iL iiiotinteit oii 20 s,,ii(I an,-l @,,,I-erebv slid level can I)c-, adiListe-,! aboat its loiigit@idinal axis, to,Yether -,v:Ltli other I)aj-,ts aiicl rtieiiibers a-, j@,iay be iecess,@iry or desi,@,,ibl(,, i-i ovder to 1.cnder the instrument co@-nplete ancl serv2.5 icelb,e in evor-%, i-espect, all as lierei,@iafter set @fortli. 'ilhe printal,y object of mv inventioii is to I)i-oducc i,- istriiii:ie-i-it, for use iiA deteriiiiiiiii<)- ai-icies level,@ A@,hicli is compara30 tively iiiexpei-ts'@ve ,iiid siml)le iii (,onstruetio,,i, (!onyc,,iiient in ope,-atio-@i. -Lnd stroi-ig aiicl is capa'k)le of beiiag aiiy I)ositi,)i-i to -vtork of i-tattii-e ot- cliai.-actel-, so (li,,It I-'L-s o-r itsefuliiesg exteii(i@i iiiost i-f i-iot all of the el-afts. Anotlier o'l)ject is to provide niy pi-otr-,Lcto,-.-Ievelt niears -svliertby a iiiieroiiieter ("qu",O, or otlier or less Si 'lai 40 rc@eap,,,ipii-ig ii)-iplein-ents i-nay be oil --e ,ipl)li.ed thereto aiicl employed Otl-tei- ob@-,cts gi-iOL ,,,cl,-%-anta(l-es will appear ill the coiirse of tl-ie follolviiig clesci-iption. 45 1 at@uiin the objects I!L(i S@6ILre the aclv,,inta('es ol' iny iive-,it:ion by tlio -ne,,ins illusti-at(,,cl iii the accompaiaylii-,- clraii,ings, in I is ,t 4Li-out elev,,t@'tion of i protracto,,-level ivlii,,h eiiibodies a praetical form of jliy a portioii of the - proL-r,,tctor @,leing bi-ol@er, i-v,-ay to disclose 'Llie loiver portioji of the 1)(,twecii siid pi-oApplicatio-ii fil@ed October 25, 1922. Sei-ial No. 596,848. trictor -Ind the spii-it-level beam; Fi 2, a tr,,tnsverse, i,ertical section through 55 said - rotractor-leaol, taken oii lines 2-2, -ed lool@iiao-. i-i the clirection of the associ@t ari-oi@,, ii-i Fig. 1; Fig. 3, a--i enl,,trged detail, i-n parti,-,l s-letion, i-ilustrating the manne r iii which said adjus@l-ing screw is co n et d ith 60 said beaiia; Fig. 4, -, froitt elevation of the I)ase aiid stipport iipon wliieli tl-ie other iiieiiib(',l-s of the iiistrztDi(,.,iat are iiiouiited, aiid, Fig@ 5, aii eli'iar,(,ed ei-oqs sectioii tliroiigli tlio spii,it level ,Ind suppoi@ti@.io, part o-f the 65 I)elltni, oTi Iiiies r)-5, looking ill the direction of the ,Lssociate(I arroil, in Fi(-. 1. Sliijilar chliracters degi,I'Itte @,iill;lai- par'Lls tl.-iro-Lighoiit the sevei@al vie-ws. What rii,,iv 'oe teriaied t'he stand of this pro- 70 ti-iietor-level consists of a bas-, I that is preferably i-ectangiil,,ir iii cross sectioii, aiad an ii-iteyral stipport 3 -,which rises from sai(I base, is cut away ii-i froiit to foriii an arcuate slioiil(ler 4, and lias iiear tl-ie top iii the traiisverse, 75 ceiiti,al, vertical plarie a serew-threaded openiiig 6. The front of the base I in the center is ctit bacl@: at 20 to the face of that part of tl,.e siipport 3 tji--it is below the shoulder 4. The si-ipport 3 is pi@ovidecl on or in the f ace 80 tliei,eof) inijiiedi,@ttely below the sl-ioulder 4 ,tiid in the triiisie@,cse, central vertieal I)Iaiie of said sui)p,)i@t, -with a pointer oi@ indic,,itor line 7, and tny si-iit@ible or desii-able scale -,iiay Ilso be provide(! in acldition to said 85 ]iiie,. Ext(,iidiiio- loi-i-ittidiiially of the btise I ii, the bottoi)i tll)ei.,eof i@,, aii il]in,erted V-sli,.ipecl (FI!OOV(@ S. A pi,oti-,,ictoi- 9, liavliiig a i@@tdius ivliie@i correspojids iiilh tll,,tt of the slio-Lilder 4, and ,. 90 ceii'uel" opening lvliieh is in agi-eement Nvitli the opel-iin(- 6 is i,ecein,ed against the 'Lront side o-LI the suppor4L, 3 ,tbove sai(I sholilder, the tliiekiiess of said protractor being equal to the @vidtli of said slioiilder, so that the 95 face of saicl pi-otractoi- is fltish with the face of the thicl@:er poi-tioi-i of s,,,id stipport . A binding scre-"T 10, passes tl-irouo-h the center opetiing iD tl-ie protraetor 9 into threaded engaoe-7@ient i,-,itli the 6peiling 6 ill 100 the suppoi-t 3 ' serves ,Ls a pivot for said protractor, and in the capacity of locking meaiis for the same. The protractor is marked on the I'ace i-ii sucli a -",ay as to prodiiee any desired scale, ancl ary of siieli iiiarkings can 105 be i.Tito tlio ill-li,:,-,toi:
[2]r,aai-l,: 7 Ly sA-v@ln"@,ng said proti-actor in one direction or ot@,ie,., on the screw or pivot 10. Superiiiiposed 6ii the protractor 9 is a beaiii 11. - Tlle be@,iiii 11 is provided with a 1)aii- Of intei-iiiedl,,ite, dependidg lugs 12, and these liig-s @tre pei-forated to i-eceive the pivot screiv 10, aiid spaced al:)ai-t, the proper distance t6 ro-ceive between theni the centi-al I)ortion of- the tol) of the protractor 9, whicii porti6.-i exteiids aboite tho sti,,,aigl-it, upper c,d e oTsl,,id pi@ott-,-,ctor and is indicatod by 9 the ntirrieril 13. Thils, it is seeii that the ILigs 12 iiith tlic, -beam 11 be tilted on the screw 10 and, @ f tirtheriiiore, that said screiv - ,ihen ti,,YIiten,-,d iii the ol)eliing @ 6 b;-iids the pi-oti-ae'L-lor 9 to the stipport 3, so that said p,,@oti-act,@,i- ciii not be i@oel@ed on saicl I sci-eiv the iront@lti(r then bcin forced 7 n 9 by the lield of the screw ligainst the front o@ the protractoi@ aild the retir Itig forced by -,aid pr@tj@actor agaii-ist said stippoi@t. At o,.qe end of the beani .11 is an extension 14 ii@Iiiel-@ is squai-e in cross section, aiid adjaceiit to tli6 otlier encl of siid beaiii is a 1.ec(,,SS l@ aild ,in oi)ening 16. The recess 15 (F,(,ns above tliilou,,,,h the top of the beaiii, 11, ,Liid belo)-@, thi-oti(,-Ii tli,-- OI)ei-iing 16 tnd the t, i be2,ii-i. The botto of the 1)( tt6ill ol s,@l cl. m i-ecess 15 is concave to provide a seat foi@t,lie convex i),oi-tioii of It head 17 aiid the o.pe,iiing 16 lias conical sides to enable a, screw i-8, wllicli 6xtends doiviiw,,irdly from tl,e head 17, to PLiove to wli,,tteA,-er extent iiiay b6 reqtiired foi-- adjttstin, ptii@poses. The JOINIer terniidal 6f tilp. tdjustinc,, screiv 18 is t'll) ed into ti passa(ye 19 -%Vllicll opeiis p t, tliroug),h the strai,)-l-it ed(,,e of the - protractor t@ tn 9 bulow the tei-minal of tlie-beam 11 which carries the lietcl 17. Tlle sellen-@ IS .ial@l pro40 iided with aii enldi!gem6nt 21 to@ ei itate i,otatiji ,g s,,tid sci-ew. Tn asseitiblii-i(y the arts el p the liead 17 1,,, cn,--,i2-ed ivitli tli-e upper ter@, t, iiiinal @of the scl.env 18, after said terii-iinal bas been iiisclrte,cl, tlii-oll(yli the openin- 16 45 iiito the r/--cess 15. By tui-ninc, the a,-Ijustin" screw IS in the Z, @-I req-Liired directioii aiid t6 I-,he necessary extent, the I)eaiii 1- 1 i@-, ll)li,otigb-t iiito klxact pai-al,t' lit edge of ].el relati.oiisl@til) ia,itli the sti, ig 50 the protr,-tctoi:- 9, )-Vllel-l the lietd f@ is iiclitened oii said screw a(ftinst tha botteiii of the i,ecess 15, aiid said recess above said head is fillecl and sp-aled with wax or otlier suitable ii:iateri,,tl, as indicated Lt 22. 5 A spii@it lei,el 23 is carried by the beam 11., s,,iia level beii:ig loiigitudiiially bored f,) i,eceii,e the exteiision 14 of said beani. The level CaD be applied to the I)eam witb the lei,el -las-, or b-Lilb (24) inii,,iedl,,itely adia@71 '@O ceiit 01- In SLIperimposecl relationshil) to ayiy one Of tlie@ four sides of the ektension 14. Cori.espoi-idiii(, sides of the beiiii @and extensi-oii are iii pt,i,allel planes. A set-screw 2,@') is ttpl)e(l iiit,-) t@ic@ I)Ottoni or gicle of the el 23 )vlii(@,.Ii ".g opposite to tliat ivliereiri i,539,548 the bulb 24 is loe,,,.ted, and said set-ser6A@ i@ tightened ti@,ainst the extens;-on 14, being adapted to engage any sido of said extension, to hold said level in place thereon. By changing the position of the level '@)i3 on the beam extension 14 said level can be adapted for lise -when the iiistrument is 111verted, or positioned with citlior side up. 'rhe rectangultir sh@ipe in ei-oss section of tfie base I facilitatos the use of thp. instrurnont in these variotis positions, and ('roo-vo 8 fdn cilitates the use of said instrument on shafting. @ Upon loosenin,- the claiiiping screw or l@)ivot 10 the protrtictor 9 can be swung or rockecl oii@ ,,aid pivot to bring into registry with the pointer 7,any marli oli said proti-,,ictor, and thus prodiice the required angular rel,,ttioiiship betAA,-een tile base 1 and the level 23. s In Gi-der that this instrtin-ient may have a still wider range, I pro-%Tide the s,,Il-re Nvith aD iiiipleiiient post 26. This post is tapped into tl,ie top of the bean-i 11 witli the longittidinal center of said post at ilighl@-angles- to said beam, but in the sanie plane ivitli the loiigi-1 ttii,,inal a,xis of the sci-ew pin,ot 10. Variou s implen-ieiits, Qne exairiple of whicli is ,i test indicator, m,,ty be attiche(i to the post 26 anci tised in conjunction with or as adjtincts to or Lttixilitr3, pai-ts of the pr6ti-actor-level proper. In Fi2 1 have shown a micrometer gauge 27 stipported from the post 26 by i),ieans of a bracket 28, S,,iid briteliet beiiig -qhown in F I as well as in Fio-. 2 100 The bra 28 is sleeved to the post 26 and consists in part of a@ split sleeve 29, and is provided iiith a set-screw 30, said s@tw llas,,@iDg tlirotigli 6ne bf th arms of ser( e said slee-ve into threaded enga-ement with le v , n 0 the otlier a ni of Sllid s e e ti d thr ugh r tli lattei- ari, to b ai . (,,ainst the post 2(). c II - e , i, T]i iiiiei-olyieter gaii(,e .97 is provided Witli a liorizontal arni or j.,od i'@l ivliieb is recel@7able ill the split sleeve 29. Wliien the set@!,"i-e@w 30 is loosened, the I)ra(@k6t 28 caii be adj[.isted iip atid doivn aild rotat,,tbly on the post 26,. ind the rod 31 cin be insert@cl ill the I)Iit Sleeve 29 to @ill)7 desired extent, and s caii I)e rotat-.iblv adjttst@,.-i tli(@reon. After the 1 pirts haare beeii propei-ly a(ijusted, the setserow 30 is ti(,rhtened, in-lieii,the lattei@ caiises the sleeve 29 to close on and -4ecurely clainp the rod 31, aiid enua(yes the post 26 -,iith slifficient f6i.ce to ],old the part-, in place oii 7, sq,id post. Any othei- suit-,tble idipleiiiept havinc), t 1),irt to fit ivitliin the sl)lit sleei,e 29 in be t,.sed iii pl,,ice of the inici-oi-rieter gau 27, aiid oll,lier meai-is I)esides the bi-acket 28 m,,i I 2,r) I y be stibsti.ttite(I for stid.bi,@'Icket as a ineditin-i for siipporting aii iiiipleiiient or implei-pent.9 froni the post 26. My instrtilneiit illay be used on a planeiso qettili flat work ,tnd with a micrometer
