USRE20145E - marsh - Google Patents

Description

@1.27, 1936- c. w. MARSH Re. 20,145

I 011J sur..

original Filed Feb. 25, 19:53

' Re 20,145A

U'Nlrlzof STATES PATE-Nr `ol-l-lcl-z l 7 ,n sells .Y -omsss'n clmleimnn'slnnukenn. 'ms-lm orlslnsl Ne. 1,911.4. mea Annu ze W.llarshompany,

ofll'iehlgan' mmv ssrlsl No. u41, February z5, less.' Aimliss reissue December` z3, lil35, Serial No.

' (ollas- 1) 'he present invention relates to oil seals of the ,type adapt'edtc be usedabouta shaft to prevent' the leakage of lubricant along the shaft, but the' present devices are also of general application and 5 maybeutillaedfcl'mllnyctherplll'poees.A l j "ihepresentapplicationisacontinuationin part of my prior application, Serial No. 554,841, med August 3, 1931, now Patent No. 1,901,606, granted March 14, 1933, for Oil seals, and relates particularly to one of the modications disclosed in said pl lor application, but not covered thereby.

One of the objects of the invention is the provisitlllofanimprovedoilsealwhiclllsadapiiedtoA give long continuous service without necesdty for 16 repair, by virtue of the provision of a means for automatically compensating for thewear of the parts of the oil seal. K e

Another object of the invention is the provision ci' an improved oil seal adapted tojeliminate any 20 possibility of metallic parts of the seal wearing throught-he packing or otherwise coming incontact with thelnoving shaft.

Another object of the invention is the provision of an improved oil seal peculiarly adapted to with- 25 stand considerable wear and usage and adapted to automatically take up the wear and compensateforthe samethroughout along life ofservice.`

'Another object ofthe invention is theprov'ision of an improved'oii seal in which the packing may be removed and conveniently replaced, thereby facilitating the maintenance vori the seal in the best condition at all times.

Another obiect oi' the invention is the provision of ani improved oilseal which may he cheaply manufactllred and installed by virtue ofthe fact that most of the parte of the seal lend themselves` readily to manufacture by 'stamping operations. Another object of the invention is the provision of a plurality of moditlcationsof my improved oil 40 seal; each one of which has advantages which are theresult of theparticularconstruction ofsuch `Othlel' objects and advantages ofthe invention will be yapparent from the following description and from the accompanying drawing.- in which similar characters of reference indicateparts of the several views. y Referring to the single sheet of drawing accompanying this description,

Flg. l is'a fragmentary sectional view take:l yona'pianepassingthroughtheaxisof theshait,l

showing the shaft in elevation and the details of tlleoilsealanditllinodeofinstallationirlcross*v ss rig. 2 ls e sunllsr rmmentsfyy'lew. e;

modiilcation employing a pressed metal sheet as an expanding ring; Pig. 3 is an enlarged sectionalview ofone of the V-shaped packings and expanding showingindottedlinesthemodeotcf 5 the packings into edgewise ent vvithvtheI e .Referring'to Fig. 1, Il indicates th'eframe or casing Vof amachine upon which the present oil seal is used. swch as'.Y .for example, an electric l0 motor having a shaft Il'whlch is rotatably mounted upon the ball bearings i2 located in the 'races I3 and Il. Theracell isfi'xedlysecuredin thebore Il of theirame llandthe numeral Il indicates one of sealsinits en- 1.6

mineluszsustlsnwmehnssbeenseleedmm illustrate the invention. only one 'su sesl n is employed. but it should be understood that 1 ismerelyafragmentary'viewandsimilaroilseals ,uy

may he usedvupon both sides of the anti-friction bearings fcr conilnlng lubricant about the bearlngs, end the lubrlenntlnsy be supplied by peep' ing the bearings during installation or bythe-use of standard high pressure ilttill'gs.l The installag5' tion shown is merely-exemplary of one of the manymodes oi' use otmy improved oil seals.V

` The oilseal It is preferably provided with .a casing Il, preferably stamped-out of sheet metal such -as steel', and formed with a substantially so Y.

cylindrical flange Il and a radiallyextending" ilange I. The Vradially extending flame Il is provided with an aperture Il which is dennitely -largerthantheslzeofshaftlh'andthecasing'll ispreferablyfixedlyaecuredintheborellinsuch-ss ,aml'tllnel'thattheedgeroftlleilangeilcrarly' f Aothermetallic partsoi'theoilseal'cannot come .incontactwiththeshaftll part preferably ground :e at ln me here Il, fel-mins 46" aliquidilghtjoint,andthecasing Ilisprsed l into close frictional twiththewalls ofthebore Il intheelnbcdimentiof ll'ig. i.

Theoilsealispreferably providedwithapack` ingofthetypeillustraieithepaeklngllconslst- Il of a closed molded leather ring of substantially-V mi in cross section;

The molded packing 2l may', in someemhodiments. consist of a plurality of-gspiral turns cf v-shaped packing. or in somecasea a urlllltiplie.T 50 ity of ringsmaybeused,'eachringnestingin the other and forming a member oi' substantially.. the same shape as Il. but i of a plurality of separate layers.

suene: 'me peexlnsrlnus n ls provided mi cientlyA flexible tobe forced into closer engagement with the shaft lilby any pressure which may exist insidethe packing 2 By virtue of the construction and arrangement of the packing 23 and a pair of expansion members 36, 31, the packing 23 is peculiarly adapted linterior of the casing Il and the external surfaceof shaftI Il.

Referring to Fig. 3, this-is an illustration of the section of the expansion members on the expansible V-'shaped packing 23. The spring 1.0 forces the internal expansion member 33 against the packing at the points 33 and 39, forcing the lips 34 and 35 outward and forcing the flanges 29 and 3|!V outward into engagement with the .inner wall of the casing surface and the shaft Il.

The external expansion memberA 36 holds. the apex of the packing against axial movement. The leather packing 2l is thus fed edgewlse a into engagement with the shaft i I, and as fast engages the apex as the edge of thepacking wears oif a new surface is presented and the spring 10 and expansion members keep the leather packing 23 in continuous oil tight engagement with the shaft Il.

Referring to Fig. 3, the dotted line position of the packing ing action of the expansion members on the V- shaped packing. 'I'his feeding action continues as long as the flanges 29 and 33 of the leather packing are wider than the space within which they are forced by the expansion members and the present oil seal is therefore adapted to compensate for wear and continuously maintain an oil tight or liquid tight Joint about the shaft Il. Referring to Fig. 2, the inner expansion membermay` be made of sheet metal and pressed to'V the lar engaging the inside of the packing.

- lThe expansion member 21 preferably comprises astampedsheetmetalmemberhav'inganannular concave surface which is of less angularity shape shown, being provided with an annu.-

than the external suriace "of the packing 23:

that is, the curved annular surface a initially 3| of the packing 2l and tends expandl the packing. The expansion member in the embodiment of Figs. l and' 2 is formed -by theradially extending flange il, which is a part ofthe casingof the oil seal.

In the embodiment of Pigs. 1 and 2 the parts be fed edgewlse into engagement with the flange 43 of substantially tubular shape for the spring chamber Il.' and the spring 'Il is tensioned against the fmsto-conical surface Il.

The operation of this oil seal is as follows: The tension of the garter spring 'il tends to cause the contraction of the spring 13 into the V- shaped opening between thefrusto-conicai surfaces Il, I5. Spring 1I thus tends to cam the surfaces apart and urges the inner expansion member downward, in Figs.v1 and 2, against the flanges of the leather V-shaped packing. 'I'he leather packing is thus continuously expanded and fed edgewise into engagement with the shaft Il, and the wear of the leather packing is thus continuously taken up and an oil and water tight joint is constantly maintained about the shaft Il.

This oil seal also preferably has its outer surface ground to fit in the bore about the shaft. and while the packing is not renewable without taking the oil seal apart, the amount of expansion attained by this packing and its expanderl is such that the oil seal is capable of performing its functions for substantially the full life of the machinery upon which it is used.

'I'he present oil seals are capable of giving long' service without necessity for replacement or repair and the leather packing is automatically fed into place edgewlse to continuously present a new surface and maintain an oil tight contact with the moving shaft.

The sharp lips on the packing maintain a betl ter seal than packings of other shape, for the 23 is an illustration of the feedscope of the appended claims.

Having thus described my invention, Vwhat I claim as new and desire to lecureby'United States Letters Patent is: i

'1. InanoilseaLacasingcomprisingastamped sheet metal member formed with a cylindrical outer wall and with an'end wall having a centrally located bore and an annular ridge located.

midwaybetween theouterwallandtheedgeof said bore, an end plate comprising a metal member formed with a centralb located bore. said member being circular in shape and frictionally secured invsaid outer wall, the outer wall being spun over outside of said end plate. and said end plate having an ent withsaid 2. lnanoilseahacasingcomprisingastamped inwardly extended frusto-coni-- -caliiange adjacentsaidcentrallylocatedbore. a

, sans securedinsaidouter-walhtheouter'wall spun over"l outside of said end plate and said end plate having an inwardly extending frusta-conical iiange adjacent said centrally located bore.

' 5 apackinginsaidcasingandanexpansionmember for said packing and having a frusta-conical surface extending to' said frusta-conical iiange'. said expansion memslidabLv mounted in saidicasing and i0 having a centrally 'located bore. and tension meansf engaging said frusta-conical surface and frusta-conical flange to force said expansion /member into engagementwith said said expansion member .being formed with an angular ridge located' midway Vbetween its outer edge and theedg'eof thecentrallylocatedbore, said pack- .`ing comprising a il-shaped radially expansible having two truste-'conical iianges joined along tbejline of a circle and engaging the end of the' only atgthe apex of said flanges, said packing being engaged by said expansion member adiacent the inner and outer edges of said packingy whereby axial movement of said expansion membertends to causesaid packing to become "wider and expand by virtue of -the decrease in l angular-ity of its truste-conical flanges.

f 3. 'In an oil seal,`a casing comprising a sheet metal member formed' with a cylindrical outer wall and with an end wall having acentrally located bore, an end plate comprising a metal member formed with a centrally located bore. said member being circular in shape and secured to said outer wall, one of the ends of said casing having an inwardly extending frustoconical angey adjacent said centrally located bore. a packing in said casing and an expansion member for engaging said packing, and having a irustoconical surface extending transversely to .said frusta-conical flange, said expansion member being slidably mounted in said casing and having a' centrally located bore. and` tension 4rnear'is engaging said frusta-conical surface and.. frusto-conical ange to force said expansion member into engagement with said packing.

`a packing in said and an expansion member "fo'rsaid' packing, and having a frusto-conical surface extending transversely to said frusta-conical ilange, said expansion member being slidablymounted in said casing and having a 'centralLv bore and tension means engagingv said truste-conical surface and frusto-conleal ange to force said expansion member mtcengngement with said packing, said cylindrical wall of said casing being spun over theedgeofs'aidend platetosecurethe latterin place. Y

.5.111 an oil seal, the combination of a metal housing having a cylindrical outer wall and hav- Y ing an/inwardlv extending end wall, said end virali having a centrally located bore for passing a. shaft or thelike, said housing having atits opposite ,end an. end plate of substantially "circular forni adapted to be received inside said cylindrical wall.I said end plate having a centrally l' Aliicatetlbore for a shaft, a packing in u said said packing being substantially t '4. InanoilseaLacasingcomprisingastamped! an end wallhavinga cen- V-sbaped in section and comprising a pair of substantially frusto-conical Joined at an apex along th'e line of a circle, and the apex of the packing engaging one of the ends of said housing, an expansion member adapted to engage the outer-andv inner edges of the opposite end of the expansion member being slidf, gbly mounted in said cylindrical wall and being formed with diagonally inwardly extending surface, the other end of said housing being formed with a similar but oppositely diagonally inwardly extending surface forming an angular groove between the end of said housing and said expansion member, and contractible resilientmeans lovcated in said groove for forcing the expansible member away from the adjacenty end of said housing to expand said packing.

6. In an oil seal. the combination of a metal housing having a cylindrical outer wall and having an inwardly extending end wall, said end wall having a centrally located bore for a shaft or thelike. said housing having at its opposite end an end plate of substantially circular' form adapted to be received inside said cylindricalwall. said en d plate having a. centrally Jocated bore for a shaft, a packing in said housing, said packing being substantially vshaped in cross section and comprisinga pair of i substantially truste-conical iianges Joined at an apex along the line of a. circle, the apex of the king one of theends ofsaid housing, an expansion member adapted to engage the vouter and inner edges of the opposite end of the packing. said expansion member being slidably mounted in said cylindrical wall and being formed with a diagonaliyvinwardly extending surface, the other end of said housing being formed with'a similar but oppositely diagonally inwardly extending surface forming an angular groovev between the end of said housing and said expansionmember, and contractible resilient means located. in said groove for forcing the expansible member awayi'rb'm the adjacent' end of said housing to expand said packing, said contractible resilient means comprising a helical garterspring.

.7. In an oil seal. a housing comprising a stamped sheet metal member formed with an outer wall and with anvend wall having a centrallylocatedboreforashaft,anend plate-comprising a metal member formed with a centrally located bore aligned with the ilrst mentioned bore for passing said shaft, said end plate being circular in shape and secured to said outer wall, forming a casing with two apertured ends, one of the ends of said casing having an inwardly extending tapered ange adjacent said centrallyk located bore, a `pacliing in said casing.

and anexpansion member for engaging said vpacking,said expansion member having a tapered surface surrounding a centrally located bore, the taperedl .surface extending transversely to the l' tapered surface 'at one en d of said casing. said expansion member being slidably mounted in said casing, and tension means engaging said tapered surface to force said expansion member into engagement with said packing.

8. In an oil seal, -a housing comprising a stamped sheet metal member formed with an outer wall and with'an end wall having a centrally located bore for passing a shaft, an end plate comprising a metal` member formed with a centrally located bore aligned with the iirst mentioned bore for passing said shaft, said end platebeingcircularinshapeandsecuredtosaid said packing comprising outer wall. forming a casing with two apertured ends, one of the ends of said casing having an inwardly extending tapered ange adjacent said centrally located bore, a packing in said casing. and an expansion member for engaging said packing, said expansion member having a tapered surface surrounding a centrally located bore. the tapered surface extending transversely to vthe tapered surface at one end oi' said casing, said expansion member being siidably mounted in said casing, and tension means engaging said tapered surface to force said expansion member into engagement with said packing. a molded leather ring having a pair of frusta-conical flanges joined together along the line of a circle and having beveled edges for engaging `the shaft and engaging the outer'wall of said housing.

9. In' an oil seal.. a housing comprising a stamped sheet metal member formed with an outer wall and with an end wall having a centrally located bore for passinga shaft, an end plate comprising a metal member formed with a centrally located bore aligned with the first mentioned bore for passing said shaft, said end platebeingcircularinshape andsecuredtosaid "outer-wall, forming a casing with two apertured ends, one of the ends of inwardly extending tapered flange adjacent said centrally located bore. a packing lin said casing. and an expansion member for engaging said packing, said expansion member having a tapered surface surrounding a centrally located bore. the tapered surface extending transversely. to the tapered surface at one end of said casing. said expansion member said casing, and tension means engaging said tapered surface to force said expansion member into engagement with said packing, said packing comprising a molded leather ring having a pair of frusta-conical flanges joined together along the line of the circle and having beveled edges for a shaft and engaging the outer wall of said housing and said packing being engaged by said expansion-member and one of the ends of said housing, the engagement on one side of 4the packing being at the inner side of the flanges adjacent the beveled edge and on the other side of the packing being at the apex of said flanges. CHARLES W. MARSH.

being slidably mounted in.

said casing having an.

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