Reusable masking boot for chemical machining operation

Gaston, D. H.

English

NASA Technical Reports Server

https://ntrs.nasa.gov/search.jsp?R=19700032717 2020-03-17T02:16:09+00:00Z
3,323,957 
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1 
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a n  aJJitional object o f  ibis invention is fo provide a 
3.323.967 conp!clc!y flexible n n s l i n p  buot whish may be r e a x d  JT..%Si;:ZC WE%-ICE m.rny t imes  
,P:II~PS E. n'elh, rldrr,iaisira:or of 1st Saliona! ,Ae?o- 
;,uuiILx Sp2cr AiItq,i,iirt;p!~on- rep,.ct to an . Glhcr o b j e c l ~  2nd adv3nta;cs of the present Eflveniion 
ic,c,:,ion of tjor,n:d S:rrt :;ieco. 6 trill tvcorne app:treni when con<ic:eril~z tile f~ , I lo -~ in_=  
F l e d  J u w  1, 1964, Ser. So.  37i,S55 dcirtiied dzwription in conjurici ;~n with i;?e ;~cci~r'?p:~riy- 
2 Clai~:~s. (Cl. 115---345) inc dr~\\:infn wherein: 
FIG. 1 is a pictilri:ll view i1l::slr-ling the Rcxibic m(i\k- 
T?!e invcn!ion dcscribcd !~:rzin a.25 m?dc in the per- ing bvoi in :i plzce o n a  workpiece. 
forcianqe of work 3 n t e r  s SA5:I can1r;ici x d  is subjca 10 FIG. 2 is a ,side, c!c..~ation in cross section ill!:s:raring 
lo  Ihe provi>io~.5 cf ~ i c i i c i ?  305 of :he &..iion;il Aeion?.u- ' ihe ma.tl:in; boot filled c,ver a vvorkpicce l ~ i r h  3 1 3 y ~ i  of 
tics ::rid Space Act of ICiSS, Pilbilc L3k'v' S5-5-Xs (72 5t:it. burlap dit;pc,scd bcruecn the \ic>rkpicce and b3ai. 
435: 42  U.S.C. 2457): FIG. 3 is n \rizrv, pnnl:~l:y brokcn atTray. ill::sir-ring 
The prCSXJ1 irlvCl::icn rc!?!:? t3 L'CVI'CCS for  use in  nn cnlho:imcy!t of the inyc1jijt.n 'ytlc;Cin the I2yrr of 
'C:i~:ilical r i ~ i i i i n  (q.:r:llic~:s p:hc;cin pcr:.ic?ns of a uork-  15 fihr<)1ls fj-r:~~cr;:ll ];as ;;ld iil::trad riier,-of 
piece aie to he .ri~::pcd by c;;crr;ic-l ctchinc. h : o r  plr-  the inner surf:t-c o f  t!~e n,n\ki:lg has been rorlccti;iefied. 
licalnrly ihc prtscni ii1t'-fi:icn rc!~!es to  a ma4.li1_r ~ K J I  Kc.!crrin_r now to ihe dr:~win_~s. I'IG. 1 ili;!strz:ts on  
to hC !i:lcd on 3 uor'hpizc: n:iciei-y on:!. ponions u: rte a~\ec th ly  u!,criin a nlasl:ing boi:l 10 112s kern :,pp:jcd lo 
uorki'iC<e (0 kc n ~ i i k d  tY;1! bc CXFGSC~ to t:-& c l r h i r . ~  a workpiecc 12. 7-]lc n,:,sl:inz );on; Is coinposed rn:irr?y 
soiu~ion.  3, c f  ruh'ie: o r  some o l l ~ f r  c':~ir.:!hle flcsihie nxrtt; i::l .s? lh:rt 
Cl!c:r,ic:~F millin: !s a p m c i s  c,hcrcin j,or~i;x~s of 3 ,it c:ln ep;.Iiccj ;o tj:c \vor>piecc in form f : ~ : i : ~ ~  33-3- 
\ ~ p O r ~ r i ~ ~ ~  nrc rcrno\.cd o r  sl:;~p:d by csi;r~\i;ig r!%c per- r?cr. Tk,c r;l;ll!.;n:: hot!: is i n  rht. fcl;,l of 3 b:lg o r  cn.,,cju;t 
iions to ;1 ch:rnii..il ctc11iz1~ rol::iian. Ir, order lo c;rrrq' osr :,hic)l ci>mp!~rc!v enc;:,:.es wprcpicce exc27r t;:.t 3a 
1l:ib :~:.r*<chs i :  is r:;chh:ii). tk:~: rc;rii.>r:b of 1t.e \:.ork~iccc ojcni;lg 13 .in ;hr  nj::s~iil; ho0t CXPO,Ci 1; 
301 11) e!i.!l;.d he pl<~lC<icG fr0.n :he clc:?i::; s.d1:;li:>n. 25 the \\rorLpicce \yhich ii si;$.!.l:;v );lrger t;;:,fi , l ie  :ryrn be 
A !t:~i!ioif p i ' ~ ~ i i l ~ > I y  crnplir!cd lo prclcct t:,i.:-c p:) ; i l~;?s . rr;iilc.j. l'jlc (jpcl;jn: ill i;ic ns:i,k.in; l.cioi s de;in,.~ .s3. a 
of 2 \i'orL,?iu~s V.':lS 10 conl?:ei<:y Cct.!l 1i:c c.of'i.::icce. > y  c ~ n t i : i : ! ~ ~ , i  edSC pny,jnn I(>, This ciinlin.lr:iis c!b.e wr!jc,n 
i t  i n  C j r .  1 2 I :  n : 1  f is >~;~;: t j  :a i i ; ~  no.;Lpiccs by p!;:r:ic i : l ~  2.1; tir >i,:?:;f c:hCr 
1!1:1dir2 n;::!eri;il \:.:\ rhcn ti.n:c,-.cu' o r  :I-immc; :o  e:<p:: %~:i:.>k-l.? sc2!i1:: ~ ; C : ~ I I S .  'rh+. bc::li;~g (.tf the I;?:,&~I? h ~ o t  
i ! ? ~  :lr..:j\ o f  ;hc wr~r1,piccc \\i!i:h Gcrc to hi. ;:iilii.d. .l.lii> 30 is ;?c(cssnry 30 t.i::~l :i v;icttum c:ln kc d ; a ~ \ r ~  :'a5<: the 
ci<ISi>d rtqttircd :hc u.;c c f  13:;: r;:;::n~iiic.c, o f  nia,,hifig boot 14.) p!'c\%:iit zn;:ii!g or s!inj-in: t!,rrei?f ::nJ :L! :~c*iirt 
m:.li.;i:lls ,1:,rticzlnrly \rhen I.ir=z \rorL;.le:es ucre  :o b.: 3 liyii: a~.:ti.:ng of lhe 1.col 1,) l!tz t\,orb.riecc. 7 h i i  is 
miijcd, IYtifihcr. in crdcr to a:s:~r? lh;; p t r l l o n s  of  [he : ~ ~ ~ ~ : i i ; , l i \ h < i :  !~ connt-c!ii?;r a ca:t!um pi!i??p (no r  sl?o;in) 
wi.lrL.?icce 10 bi? ~ l i l ] ~ j  v,crc p ~ ( ~ l ~ ~ f ~ d  fFCII: I];.' e:ifi- 1 0  skici.ion :IOW 10 which is S ! I X : ~ C ~  to llle inn\hin;, 'root 
in: sp~/l l iun,  it v!.(:ts I,1.ccis2i-s to ;ioroa:!l;lq chczi; ".- ,) , 3" 50 2"' bc in coa::nunicatinn \viih the iate:iitr of rhc 
c,jatin2, ,lis:l,il12 n::licri:,i for r;:l~lolcs clhcr dc- m:~\Lins 1-0s:. In order to 2>2r:ilr thai :) pond V::L~IC.;I SCLI 
ficr,;. ,(,, la!tr uf m-,Linf r!lr:eriz:l +< ~CXICT:C!S over :!:c cri!ire inn:'r ~ ~ i r f a z e  of the b.wr r !:;>c'r of 
s;ri;i?:d from the x.i;!k;lic.ce s,?>rn tile otilling proceis Surinp 22 o r  so~t;:: e;hcr >ui:>hle fibrotis 112;itcrisl i, dii- 
. .\.IS .. ;cmp!:icd. it  i i  ri:;tli!y ::yp-i:nt :!rzt 15is previous p o - ~ d  'scl\;~.cr; ih:: n;::a!~.i~lz bet-t :trd !]I? wor;.picct. 
nl,.:ht:r: of m:,l kir.z :>; a c_;isii;ning 'O I f  dchircd l?le 1w-r of i?~lr l :v c:ln be o n ? i l l t ~  ii.wf:id 1::r in:l-r :.tlrfnce 23 o f  lbe n?:ichi!:z bbol cnn be rc:+;h- 
.I:< r.spcn.ci\.e opcralion. e n d ,  :;s iilc\tl-:iicd ;:I i-!C. 3. :c n-itiic :! ci>~~lp:c!e v2zr.i$;n 
The prcan:  i11ke;;iio;l ii  -n jr:?yrovc:ncn! in !h::t i: 
,it;,in hot,l. s ; l j , s ~ l $  k~~~ n,:l((.r;:r) -,5 is r,-pl;cd 
cl$:?:n:.ic:3 m:iy of tlic ti:t~e i o n ~ t i n i ; ~ ;  rind cxrn&n.ivc t o  the 5e;,jCf: Cd6CS Of : I , ~  mn,;:ing bqot :Ind tr;n.nlcd, 
rr;::skin: oycr.t!i~v:s ::ere-stry l o  pre?;tre 3 n.ork,r.ie:e f ~ , r  4 5  ivilh (i :cn~pl;tte for cxanplc. to cr?c13c iEls cxnct si:iflcl: 
c~~cnlic:il i!:i;iln::. * l h L  is sc.zr.n~?;lhx!. Srii,i?.i. ky pr.+ :Ir;:, of the \yorkpiEce to  L ; ~  nli!!ed. in so;ile j!ls::l.nscs 
vidi:tl: 3 n?.;-.Li~:g ;~oc1  co:;tp~, ec! eniirtIy of ::ezi5lc $ 2 : ~ -  ii  n;zy not bc ficccseary o r  .dc>ir:;>ji. lo  ::,,?!y i nqal..;:inZ 
ria\ ~ 1 . ~ 1 1  Ls rr;!>!>: ~r 5ci11re 6;ll-r sditshie n?s:cri.<l. ?he nl:;!cri:,] :,nd if 1!]is !he cahe :l,:.fi 3].,,lic r:tn- an 
1 : l  1 s I ! !  1 1 1 l : a <  2 & !r-ia;nled 1" e2;pobc ,q:ecis a.ra of l ) lc  ),,:rri,,7+-e 
of  lhe \vo:: .~J~ce is C L , L C ~ ~ ~  C X C ~ ~ I  i..~r ;:n s.crr s!!chr:-: 50 
- lo  be r:!ilicd. .4:rer :he n1:r-k.li~,o opcr:t:icln is c,::rq-k:cd 
. . $:irger th2n I?::: it> hc r.l;il:d. i ' t g :  ;:~i:ic;?> of :ire n;>rn!.rig ;hc xor.:;ni,.-- - L C  1::J IX?S;~!~,: bool.:~re i r n r ~ ~ ~ c ! ! ~ ~ !  in a stiii- 
[ j c t  1 I o I L i e  o 2 i i c:ckjng ,&":ion w!,-re mi!iinS oci-:~~s- 
:-ej!cJ :a ihe uzri.;:;ccc a::d 3 v;cu~tm i., dr:::';n l ,-~::.~n n 1 i 5  cuinp:e!,-> lhe dc\cripiion of r lbe ;ni..enli?n: ho;v- 
;ht: ~ : % i k i , l p  17oui 2nd ~ l j r :  \ \ ; .uikp!~c.  '1 s:i1:1!: anlbilnt c t f  55 cv;:r. :irt;r ix.i!i & pnny  ~t : ! ; :~ . ;  :~72 m;).fi!;c:1:i;nl l:*crs- 
1 I :  is p 2 I ?  : i d  e :  o 16 ,w;:lch c;tn t.e rr:sJc v.lrhocr ci<>;tlii:y :r,,ni rijc :,pifit 
lht: r;lscLin;~ bui?! iiilc! t.iis 31:;s:;ia: ri:aiciia! is :;i.Time(! LO :17,(! 5:3*7e of :!:J i;l~cr;{ion a s  C;cfir,cc; '3). tile 3 p ~ o & &  
c x p ~ ~ c  cniy :he e ~ r . c t  ::re3 0;  ilic ~~oiI:pIc.:e iii b: n:iilcJ. c!j,ims. 
Thi!s only reiz;:vcl> snlali q:r-nri:ks cci rnn*.lir.p r.?s:.;iial 
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\l'R:~t is c!simcd is: 
%,;:I bc u ~ c d  :ihcn :!!e pr.-.cr?t Ir,..rr..rton 15 c:ny:cyeJ 2s CO 1. A d e v i x  lo r  L;;; on n wo:::~icc: to  be ir;l,ne;:cd in 
c u m p 3 ~ e d  lo tit: s n l o ~ i ~ l  of i.k- q-eiLiag r.x~tcriai :;%LI :!n e!i!lin= so!ti!ion co;nrisir.=; 
in  :he p;;;~' 1:-1c:5od d i ; ~ ~ s ~ V ' ; i  ::bye. J+t?ei: 1hc n;il!ing ( 3 )  a maskin= boot ~ 0 : n p ~ d  m;ir~!y of a AcxihIt, 
pri-cers is ccc~;tpic;e the rna.'hin: 2nd s c a l i n ~  mn;ciial:: ;tie imperrpious, r u y w r  ~ n n t c r h l  uhich er;clcl;-s the ez- 
si+pc.J 05 2nd the d,kib?e rn;lsLing b , ~ t  I. r:.nlcvcJ f w m  tire wcrrkpiect excrp for a sut-;;lzc ares $!i;:l?;y 
ih2 p,:a:rt. Tf;e msi l~ ing  boot is nor di imagtJ cuiirz re- a 1::;ger ;h:m 'lh31 10 be etched; 
il:c..r3j a ~ d  i p ~ s r j  inzzy e ~ e i  (b)  said maskin2 tibor h a ~ i q g  s cn!ilin~!cf;:< c 2 ~ :  -;.?jr- 
1~ is :heref~:r, a prinoipsi o?-j;.-ct o f  this icve7:tion t . ~  rivn rhat deAncs a n  qynii lg in $:lid :h35%jnz bmx 
Fro\.i~- a m:l&icg ;3~pxmlus ii::z;sin pizp~r;?io?y m s k -  a.i-irk espcces !he st!rf~ce area of ~ h c  worbpiece 10 
in2 c;pa:~:isni nccescsi-.y to prorecr a x+.orkpie,-e citi;l'ng a he etched; 
cl;cnic21 ;.li:iing o;:cmliun fra;.r bzzn con-.idrrsi-15 re- {c) r;+:c m e x s  hec?edcally sealin2 the c n n t n u c u s  
duccd. edge sf said mad.ing boot to the work pic,^ dad 
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3,323,987 
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nz~J2;;g the x:~.ctf:pir.cs so that only :he ~ r c ~ i s e  area (c)  t 3 p  mcxrj ? - c ~ ~ I ~ c L ( ? I Y  srz!ing is* con:in::o~~s 
to be c ! c t s ~  IS !;?f: e.:;rowd; e d : ~  of ~3;d -.-$-:.ips toct to I:-: \ ~ ~ ~ : . j ) i ~ i e  and 
/d) rn2,*ns for e%zcirn:;ng air enimpred Cct%cecn s-id m.!,kiqz :be so". -:--- ..CLL <o thn! oziy :he piici?.;: arts 
r;ms!.ic: boot ai?d sni:! \\ror!.picce lo pravide a vat- io be azht.2 ;> Fst e.,pcccd: 
u ~ r n  x 2 ?  :!~rrrbc:;ccen: 2nd 5 (d) mear.s fct c;~::-~IIz_~ - .  a?: cnqrt.p,xd hetsxn said 
(c) mc::ns coc;prisirg 3 fi'rro~ts 1 ~ ~ 3 i ~ ~ i 2 l  dii?o>ed k- m;.si:i!g tih3; z ~ d  s 2 d  ~ < l r l , ~ i ~ ~ e  to p ~ ~ l \ i ~ l e  a 
Ix-.tcn -.?id ;i1:14.in~ h o ~ t  and said worl.;)rie 1 3  a~silre ' i l c u ~ m  .czE ;--s;:-r~~::cri: pnd 
n su5s~:!n:in!ly c<:m;lc~e ciacuation of rhe zir en- ( c )  ~;-ez:,s c ~ q ? w c :  - - 3 rc7~fh::ned inner ctirfacc of 
ira7p:d kcl\\c:n i!le xab'hing boot ard ~ h c  %\orB- lhe ficx;>!c. ~z :-,;.I C!I \~\CJ ~ C ~ ? Y C S ~  5aiC: m.r\'hinS 
piece. 10 P c ~ ?  ani! s;d.r;-ce :ct :?<\::re a si:hs:~niinlly 
2. J\ dcv;cc for use on a workpicce to bc ixmcrscd iit CT.:)?:CI: ev::-~:-*li! ~f I I>C ."r cn:r.!,n?:d he'nce11 ihc 
ni? ctc!lin: %oldlion conlpri>in:: c~.rd.Inz bcsi r=2 :\e \~.crri,?iece. 
( a )  a mac'hing bcn: compaxd enlire:y of Rcxihle im- * 
. pr rv i~us  n;alcriul vhirb cncloses the enllie work- Rrfcreprcs Cifed 
piece chicpi fc- a srirfzse area qlightiy larger lbnn 1.j 
ihal to be e~chcd; UNITED STATES PATESTS 
( b )  s:id rnns'hin2 boo; 5::vjng a con.linouq edFe por,;on 2.S20>1:! 1) 1953 Co2n:z -----------,- 156-16 
thzt dcfixes 3n openins in >aid n~.l\iting 1wol n;hizh 
exposes !he surface area of the s\.orLyicce to be JACOB H. S T E ~ L L L ~ ? G ,  P : i r z ~ c ~  E.r'su;r~irrca. 
e!chcd; 20 
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Masking device Patent

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