[1]3 @ 1 1 7 @ 0 2 6 United States Patent Office P-atented Jan. 7, 1964 3,117,02!i APPAI-',A@kUS FO'-'Z COATIT'QG MATEIPIAL TO TIIE VIALL OF A BCA'IL4 IN A ViD3- UCPT@ECE G. Pf,., @--czsign-iDr 'to r,21, - L' 5 n Oc-t. 13, 196'-@@, S@.ar. No. il,44,953 7 Claii--s. l,cl. 113-215) This invention i-el,-,tes to apparatus for q,,)plyin., a coat- 10 in., to the wall of a bore in a workpiece. Althou.-h adapted to wide use in this field, the ihlustrated embodiment is particularly suitable for automatical.ly cotilrolled applic,,it:on of a fiuid coating to a boi7ed hole in a machinery component into @vhich another part 15 is to be pressed with an interference fit, in order to facilitate the pressing operation Nvit-hout scoring of tho contact surfaces, and '@o aid in the control of tightness of such press fits, as v.,ell ias to provide a frict-'@on 1,,ibri-.ant des,rable for removing the same part f-rom the bored hole 20 when requ-zr---i. T@li,-se conditions are typ-.cal of - railroa,,l car vihe.- is, which are pressed onto their axles viith a precise fit, in order to withstand all operational forces :.n railroad service sa,'ely, and at the same time should ailow the removal of the ,vheels.Lrom the axles -'Lor replacement 25 without destructive dama.-e to the wlicels or axles. in ord@-r to coat the,@l@heel bores properly, a niixture ol basic carbonate,@,@hite lead a-,id bo@@led linseed oil is usually applied to the press-i9t surfaces in ia voluriie, surface area and de.- fee of uniformity prescribed by practical experi- 30 erice. in the past the coati-@ig has generally been --pplied by hand by a skilled mechanic in an amount est;mated by him to be sufficie-,it, but experience sb-ows that in practice ti.ere is occasional diitic@,ilty or damage from scoring, due apparent', y to inslifficiently uniform application, and freq,,iently too much or too lit'tie coating material has been depos'ted. An object of the invention is to provide apparatus for mechanic ary and uniformly applyin.- a controlled amount of coating material to the wall of a bore in a worlpiece 40 so as to mininiize reliance on personal skill. Another obliec:t of the invention is to provide coating apparav-ls of the aforesaid type, which is easily adaptable to automat;c oderatic-,l and sequencing. A further ob,;ect of t@ie invenlion is to provid-. coatina apparatlis which within a predetermi-@ied range is automatically adji-isted in accordance w-ith the dia-meter of a bore in a worl@piece to be treated. An additional abiect of the -nv@-ntion is to provide apparatus for @ipplyin.- coating material to the wall o-'L a 50 bore in a worlcpiece by means of a roll-on operatioi alloivi@ic'lose control o@ier the -,imount depo@sited; which WL'I Ivo@d waste and air contan@ ination due to - dispersion of the coating material as would be encotintered in brushi erations. 5,5 -n.- or sprayin.- cp It is also an ob,@'ect of the innention to provid-- apparatus in vvhich an applicator for treatin- the wall of a bore is supplied w,'@th coatin@. material in a retracted position so that this phase of the op@-rition can easily be observed and controlled, tL-,e material be@'@n-, fed to the outside o@f 60 th-, applicator in a man.,icr sucli as to eliminate narrow inter-.ial chann,-Is Nvl-,-ich Nvould be subject to clogging upon the forma@lion oll d,-pos;ts of he,-,ilier - ceipi,3onents of the coatin- material. Further'objects, feati-ires iand advaiitages of the inven65 tion will becor--e apparent as the descriplion proceeds. in the drawings which ilitistrate an embodiment of ny invention 'oy way of example, FIG. I is an elevational section; 70 -'71-G. 2 is an end view taken in th-- direction of the arroiv 2 in F-TG. 1, but sho,,@vn ori a reduced scale; r-'IG. 3 is a p-lan view drawn on the reduced scale of FIG. 2; '@71G. 4 is a fragn-ientary, diagran-imatic section generally similar to FIG. 1, but drawn on a reduced scale and sho-vvin- the apparattis positioned adjacent!a work@piec@ to be treated; FIGS. 5 and 6 are sections similar to FIG. 4, but showin.- the apparatus in different operating positions. Referriii.- no,@v to the drawings, there is Qhown a base 20 of preferably welded construction to which are secured at on@- end by scre,.Fis 21 a split modnting collar 22 and a be@-riiig coilar 23, and adjacent the other end a bearing 24 with cooperating bearin- cap 25. Rotatably mounted in bearin-s 23 and 24 is an assembly comprising a drive tube 26 and @a drive pulley 27 rigidly secured thereto by screws 23. Lubricating means 23a and 25a are provided for t'ne bearin.as. A preferably air driven motor 29 mou,.ited o-@i base 20 and having a sheave 30 thereon is coniiected by a belt 311 to pulley 27 for rotating drive tdb@- 26. Te'iescop,.cally and coaxl:ally mounted in drive tube 26 is,an assembly coinprising a carrier or driven tube 32 and a guide and stop bi-ishing 33 rigidly sectired thereto by screvis 34. Bushin.@ 33 slidably engages t'@ie inner surface ol. drive tube 26 as best s@hown in the IoNver portion of F-IG. 1. A key 35 fitted in bushing 33 is sladably received in a keyway 36 in drive ti-ibe 26 so that driven tube 32 Totates with drive tube 26 and is axially reciprocable therein. FIGURE I shows the driven tlibe 32 in its inner or rotracted position. An abutment or stop,surface 37 in d@-ive tube 26 is arranged to engage the end 38 of bushing 33, thereby limiting axial slidin.- i-novew-ent of driven tlbe 32 to the left in FIG. 1. A cylinder 40 which is operated by fluid such as air has a cylindrical head 41 :at its outer end and cooperates with a piston 42, a piston rod 43 extending through the oppos-te end wall 41a. Cylinder 40 is supported within driven tube 32 at one end by mealis of a bearing assembly 44 and on piston rod 43 at the olher end bynicans of the solit mounting collar 22 in which the outer end portion of pistoii rod 43 is rigidly claniped. Bearing assembly 44 is arranged in driven iube 32 for reciprocation therevth and is also slidable relative thereto for limited axial movement tlierein from ian inner abutment 45 to the left in P.'-G 1. Tih,-bearing assembly 44, con-ip.-ises a radial and thrust type ball bearing 46, the inner race of which is mounted on cylinder head 41. This allows the uliter portion oi' beanng assembly 411 to rotate with idriven tube 32 without rotating the ey'linder 40, yet transniit axial moverient to tube 32 so that the cylinder iand piston unit 40, 42 will serve as an actuator for reciprocation of the driven ttibe in the manner described later. For adrr,@itting and exhausting compressed air to and fro-m both sides of pisto-i 42, piston rod 43 is composed of an inner tubul,,i.- men-lber 43a and a coayial, spaced outer tiibular member 43b so as to provide a central bore or channel 47 1,-ading ftom a connection @or opening at A to a forward chan-iber 43 adjacent tihe cylinder head 41, an annalar separate chantiel J,9 being formed between tubes 43a, 43b. Tne latter are lightly secured to each o@her at the;r ends -so that channel 49 is sealed, except for a co@ipection or opening B iadjacent o-@ic of its ends and an aperttire 50 adjacent the other end, the aperture 50 leaditig to a retlirn chamber St between piston 42 and cylinder end wall 41a. The openings A and B con-imunicate with a conventional control valve (not shown) which has i-.ii-,t and exhaust ports @and is connected to a source of compressed air. An aliplicator ofi'setting mechanism generally indicated at 52 cooperates with bear-ing assembly 44 and is conno.,@'Led to a shaft 53 oq ivi-@icn a cylindrical applicator or idle roller 54, preferably @of the felt disc type, is mounted
[2]3 with the aid of a wing nut 54a or the like for free rotation. Mechanism 52 is thus interposed bet@veen ti'7.e aettiating means 40, 42 and the applicator 54. Shaft 53 has an arm 55 thereon and carries a pair of parallel spaced pivots 56, the axes of wiicn are disposed in a plane transverse to the common axis X-,%' of the tubes 26, 32. A further pair of parallel spaced pivots 57 are provided on an offsetting bracl@et or head 53 and are received in extensions Sga thereof, the head 58 being rigidly secured to the outer end of driven tube 32 by sr-rews 59. T@he axes of pivots 57 iare disposed in a plane parallel to tlle plane of the axes of pinots 56 and are parallel to the latter axes and spaced the same distance apart. Pivots 56 are connee'Led to pivots 57 by a pair of offsetting arms or levers 60 which are of equal lengtli betw-.en pivot points @and parallel to each other. Each of the levers 60 is bifurcated at one end to embrace shaft arm 55 and receive the resp--ctive pivot 56. The other ends of the levers are positioned between the extensions 58a of head 58. An extension or cam 61 is provided on each of the levers 60 6nd urged a-,ainst t-he front portion of bearing assembly 44 by a spring 62 which is compressed between a tensioliing cap 62a in bracket 58, and an abutment 55a on shaft arm 55. Down,@vard movement of an-n 55 is limited by the bearing assembly 44 contactin-, cams 61, !and this wPI detennine the retracted or rest position (FIG. 1) of appl@icator 54, in which the applicator support shaft 53 is preferably centered, i.e., coaxial with tubes 26, 32. A stop ,- crew 63 provides for adjustment of the retracted position if required. It will be clear that the bifurcated arms 60 ,are thus mounted for swinging motion along a vertical plane through the common axis X-X of tiibes 26, 32 to move shaft 53 from the concentric position shown in FIGURE I to an offset position, and throughout this Tnovement the axis of shaft 53 is maintained parallel to the axis X-X. It should be noted that spring @62 is of sufficient strength to keep can-is 61 of levers 60 in firm contact with bearmg assembly 44 and to hold the applicator 54 in its central position wi'iile the air pressure in c371inder 40 is relatively low, but the spring will yield when the pressure is built up as described herein later. Feeding means is provided to pour coating material on applicator roller 54 in a desired pattern wlien the Toller is in the retracted position of the assembly illustrated in FIGURE 1, comprising a vertical feed pipe 64 terminatin- in a distributor or dispen@ser pip@ 65 disposed above and parallel to the applicator 54 in its retracted position. In the embodiment shown, the distributor is positioned over a lateral portion of roller 54 at the side where points on t4l-ie surface of the roller move upwards, -,Vhich will allow ample time for absorption of coating material before it is carried to the underside of the roller from whicii excess material ivill drop off. Distributor 65 is clear of the path of parts attached to driven tube 32 and preferably is provided with longitudinally spaced orifices for discharging the coating material o@ito the surface of @roller 54. While the apparatus is in its retracted position, a controlled sti-eam of coating material is supplied through feed pipe 64 from a constantly agitated supply tank (not sho,6vn). Excess material will drop from roller 54 into a container 66 thereunder, from which it flows out through a drain pipe 67,and back to the supply tank. At the start of the operation, the parts are in the retracted or initial position shown in FIGS. I and 4 and mgtor 29 is actuated to tum tube 26 at ia speed of approximately oiie to two revolutions per second. Key 35 will cause the carrier or driven tube 32 to participate in the rotating movement, and the offsetting mechanism 52 wl:ll also be taicen along due to its head 58 being secured to the driven ttibe 32 at 59. As at the start, the axis of shaft 53 coincides with the c,;@mon air, X-X f tb,, 26 and 32, the shaft will tum about its own axis at this time. Roller 54, although freely rotatable, on shaft 53, turns therenvith when not in contact with any surface tO 3,117,026 4 be coated, due to sl-ight friction where the roller rests oil the s-haft. While applicator .54 rotates, coating material is supplied through feed pipe 64 and distribtitor 65. The rolier is thus covered uniformly with material in a desired p-attern while in the rettacted position. As soon as the roller moves froni tiis position, a switch 6,v), previously actuated by a flange 69 fixed to head 58, wiR be reltased to stop the, sil-pply of coating material until the apparatiig reti@rns to the retracted position. It should be noted that 10 flange 69 extends entirely around head 58 to be ejjga,,ie@ able with Y@v;@ch 68 in any angular position of the rotatable head. To facilitate the handling of cap 62a, lianga 69 has an opening at 69a. The apparatus and a workpiece sucli as a wheel 70 15 (FIG. 4) having a bore 71 to be coated will be positiotied so that the axis of the bore is aligned wi t e commoli axis X-X of tubes 26 and 32. By admitting air undet pr--ssure at A and connecting the opening B to exhaust, cylinder 40 is moved to the left in FIGS. I and 4 to push 20 bearin@, assembly 44 forward in the same direction. The bearing assembly is in contact with cams 61 of the offz f;etting meoh,,anism 52 and will advance this mechalftisnig the attaclied carrier or driven tube 32, aiid the applicatbf roller 54 so as to position the latter within bore 71 to bo 25 coat-.d; see FIG. 5. The foregoing movemeiit i8 pdfz form--d with little resistance and at a rapid rate. Wheri the end 33 of stop bushin-. 33 enga,-es the abutment 31 in drive tube 26 (FIG. 5) and tlius the driven tube 32 ig lorked in extended position against additional forward 30 movemeit, the pressure in cylinder 40 is built up to a preset value and cylinder 40 and bearing assembly 44 will advance further, relative to the arrested tube 32. The predeter-aiined force of spring 62 will be overcome and bearing assembly 44 engaging the cams 61 will cause the 35 levers 60 to swing aroi-ind their pivots 57 so as to shift the iapplicator roller 54 from the central or concentrio, position of FIG. 5 to an eccentric position offset frotri the axis X-X ivith the applicator 54 bearin,@ agairist the wall of bore 71 to be coated; see FIG, 6. Ti-ibes 26, 32 40 Nvill continue to rotate and shaft 53 will riow 'revolve around axis X-X in the manner of a crank pin. Acwrdingly, ,ipplicator 54 will roR along the inner surfac6 of bore 71 -,vhile turning freely on t-he revolving shaft 53, Thereby, portions of the coating material previously de45 posited on the felt disks of roller 54 will be uniforinly applied to the wall of bore 71. The contact pressure between ro7,ler and wall of the bore is adjustable by varying the pressure of air supplied to cylinder 40. After a predetermined time of roll-coating of the wheel 50 bere, connection A is vented and compressed air is supplied to connection B. Cylinder 40 will then move toward bearing collar 23 at the ri,@lit in FIG. 6, retracting the bearing assembly 44. The m&chanism 52 and the applicator 54 will follow the bearing assembly under tli6 55 action of spring 62 and wifl thus return to the central Do-sition of FIG. 5. During further movement of cylinder @O to,,vard bearin- collar 23, the bearing assembly 44 enga.-es the abutment 45 of driven tlibe 32, and the latter is taken along so that the applicator 54 and the associated 60 parts are moved away froni the wheel bore 71 and moved to the initial position shown in FIGS ' 4 and 1 ' Flange 69 v,,ill then iactuate switch 60, thereby restartilig the flow ol- coatin.a material onto the applicator, wh@ich is now turning again about axis X-X, together wit-h the con65 tinuously rotating tubes 26 and 32 and support shaf-t 53. After a short -inteiial, applicator 54 will once more be carryin.@ the desired pattem and amount o'L coating material and the apparatus will be ready to coat another bore when aligned in proper position. 70 As the rate of supply of coatiiig material is adjustable,. the amouiit of deposit formed on roller 54 is easily contrliable, the roller being in its retracted position and fully visibl@e when material is fed thereto. Since narrow internal channels are avoided, the dan.oer of clogging is 75 mini-Tnized. As stated, the fluid press@.er-e. in cyliiider 40
[3]3,117,026 5 .6 may be varied and this will co@-rol the contact pressure terial may be si-ipplied,to said applicator, the carrier betweeii the applicalor 54 and the wall to be coated. may be advanced to insert said applicator in said These adjustments and the length of time the applicator bore in spaced relationship to the wall thereof, the rolls around bore 71 will determine the amount of coats haft and applicator may be offset transversely to :ng mater;al applied to the wall of the bore. 5 the axis of.the bore to cause the applicator to roll I Since the applica+lor 54 is arranged to swiig outwardly along the wall of the bore and apply coating material until it contacts the wall of the workpiece, it will be clear thereto, and upon completion of th@- coating step the bores of var,ous diariieters can be trealed without any a pplicator m-,Ly be withdrawn from said bore. adjustment or the me-@hanism so that within a predeter3. A pparatus as defined in claim 2, in which said offmi.ied range the apparatus will automaticahy assume a 10 setting mechanism comprises position responsive to the bore diameter. A substantial (a) a pair of parallel motion arms, each of said arms ran-,e of bore sizes may be liandled without resetting the parts. It will further be apparent that the apparatus is easily adaptable to fully automatic seqtienei-@ig, for example, by 15 usin.- a conve-@itional feeler as wel@l as a timer. Th,- feeler will serve to detect the proximity o'l a workpiece or wheel 70 an@l then actuate the cylinder 40 so that roller 54 will be automaically advanced into bore 71, the supply of coati-Ti- material beipg stopped by disenga.-ement of switch 20 63. As described, roller 54 will then automatically be brolight into en.-ageniont with the wall of the bore aiid as motor 29 turns continuously, the roll-on operation will be carried out. The tirrer will serve to reverse cyli-,lder 40 for withdrawal of roller 54 after a predetermined interval, 25 viheretipon s,7vitch 63 will be engaged to start the flow of coating naterial a.-ai-.i. Various other modifications and changes may be made without departing from the scope of my inven'lion as defined in the appended claims. 30 V,Ihat I
