US2436621A - Abrasive wheel casing - Google Patents

Description

Feb. 24, 1948.

A. TOBEY ABRASIVE WHEEL CASING Filed July 27, 1944 INVENTOR.

ALTON E. ZZJBEY g w, v

Patented Feb. 24, 1948 entree STATES PATENT QQFFI E WHFllLl' CASING Alton E. Tobey, SantatCruz; Gali fs ApplihationJlllY-Z'T, 1944; SeriaI'TNo; 546E821 Chitin-78 )2 (iiGlaims. 1-

The'=-invention relates to a casing or bandi un i't arrangedzlfor mounting. on: a wheel or: drum: and designedton use inwroughingr the treads of rubber tires preparatory to= retreading orrecapping same: More particularlythe invention. relates to casings of: this type employinga set of inner and outer bands arranged for mounting. on an.

expandible ri'ma oi the wheel'and adapted-tastinport abradi'n'gr elements Lint the: form; of separate prongs extendingthrough perforations hr the outer-:bandtandproyidedt withrheads held between theihandsz; on thi'ssitypei ofrcasin'g becauseathe prongs are formed? separate oi thezbandsa and become loosenediirr their mountingafter; therzca'sing haszsbeen' usedzforzsome; time; it: becomes necessary: frometime toetimer-todncrease:the' grip on the prongheadsaby."thebarrcls; Thisisa accomplished by-effecting am expansionof? the inner band-so flS'itO clamp: the: heads; more: firmly,- against the outer band; thecexpansionrof' the iband being-proi ducedby; expanding the resilient rim ofthewheel' on which the casing is usually mounted, In -view of-this requirement for expansion, theinner band lsrordinarilyleft with disconnected ends; and

secured to theouter: rim at but onepoint: and-ina-- manner permitting freedom of movement of the unsecured portions. However inthe-casings as-heretoforeidesigned, the attachment.- and-form of theinner. bands were generally such as'not only would afiordeatoo limited expansion of=- the band=.-but: would; permitthe-prongs when the cas lngwas removed fromthe-wheel, .or inthe' course of shipment of the casings, to becometeasily released and detached from the bands. It is an object of the presentinyentionto fOlll'lthEzbQhdS and secure them together in suchmanner, that a free and easy expansion-ct the inner band will be'readily permitted when desired and at the same time insurin the retention of the prongs on the casingrirrespective ofiwhether the casingis: mountedon the supporting. wheel..

Another object of the invention. isetot provide. a casing of the character described in which there I 2:; showing= made:by:-thesai 'didra-wings anddescription maybe": adoptedf within the scope of the invention as" set 'forthtin the: claims,

Referringto said? Figural: is. a zsideiviewoi thelband of my 'invemtlon :mounted om arwheel.

Figure 2 is a vertical sectionalviewofthewheel and casing asz-shown'zin Figure 1;.

Eigureriiii iszwxsideviewtot'a: portion of the casing air-=- enlarged scale:

Figure kisservertical sectional view of: the-poi:- tion; of'ftheacasingasliown in: Figure 3.

As aliover explained; the casing Set my invention is adesignedzifor mountingona wheel or drum fiasuch as?indi'cartediimFigures .1 and.2. As here show the' wheelris formed;of correspondinghalf sectionst'l and flearrangedtmbe secured together so as to clamp in position thereon a rim 9 formed of rubber or other resilient material. The sections:a=re:mountechorrs a rotatable shaft I0 and securediin: operative relation between a. shoulder 1'21. anda one'bmmore. nuts; it having a screw v threaded-connection with theshaft. The rim 9 istaclaptedzto formia backingfor the casing; and thelatterzmayz bezsecurely heldinz-position thereon botlr: against relative; rotational. and axial di'splacementebmdrawingr the sections together and therebyscaus-ingtaz distention or expansion of the outer periphery-1' ofzrthetrim.

Asz-willtbe: clear: from: the: drawings the casing is; formedwwith external andainternal bands l4 and I5 each of generally cylindrical form and withr thee-banda lfi, positioned substantially conoentricaliyrwittnbandi- I 4'; Both-bands are formed of:resilient:sheet-;.metal= and:the: outer band I4 is formed? withcperforations: l6 through which are extended, abrad ing. prongs I]: having heads I positioned? betweerrthe-bands, Band I4 is designedetonprovide'j airing-or. annulus of fixed circumference: and; is. preferably 'formed, with outer andliinnerroffsettend'portionsfiw and 2] desirably overlapping:on'eanothen' and secured together by spot welding; that. therendZ? ofthe outer portion 20.: Band; Hie-is likewiseeprovided. with, outer and inner end-l portions 24 and25 arranged in overlappin relation andtpositio-nedin the outer band with themuter; portionzzdtarcuately aligned with but spaced from inner portion 2|. In distinction to the portions 20 and 2| of band M, the portions 24 and 25 of' band l5 are arranged to be left disconnected from each other but retained in lapping relation, and as a means of holding the band 15 within band [4 and preventing the relative rotational displacement of the bands, the bands are afiixed such as by spot welding 21 at a point of portion 2i outwardly of the end 23 of portion 20, and relative to portion 25 inwardly of the end 28 of portion 2|.

The inner portion 25 of the internal band l5 extends considerably beyond the free end of portion 24 so that while the portion 24 i movable ciroumi'erentially relative to portion 25, the former will be effectively guided between the portions 20 and 25 in case of such movement and retained in place at all times.

It will now be clear that with the bands as thus formed and designed, when the casing is mounted on the rim 9 the internal band l5 will be substantially free to expand since the only connection between it and the external band is at the welding 21. In this way any tendency toward looseness in the mounting of the prongs after the unit has been in use, will be taken up by the expansion of the band l5 under pressure from rim 9, and should the abrading prongs become loosened beyond the available compensating pressure of the rim, it will be merely necessary to draw the wheel sections more closely together and thereby provide a corresponding expansion of the band 15 with the resultant increased gripping force exerted against the heads between the bands.

It is important to note that inward circumferential movement of portion 24 is limited by portion 2!. Likewise, outward circumferential movement of portion 24 is limited since maxi mum expansion of band l5 will be attained bee fore portion 24 may be withdrawn from between portions 20 and 25. It will thus be clear that accidental release and detachment of the prongs from the unit will be effectively prevented both when the unit is mounted on.or removed from the wheel.

I claim: p

1. An abrasive wheel casing comprising an inner cylindrical band having overlapping end porthus, an outer perforated cylindrical band surrounding said inner band and having overlapping end portions with one portion opposing and in arcuate registration with one of the end portions of the inner band, headed abrasive prongs extending outwardly through said perforations and having their heads held between the bands and weld connections between both overlapping portions of the outer band and substantially between such portions and one of the overlapping portions of the other band. a

2. An abrasive wheel casing comprising a cylindrical band having inner and outer overlapping end portions, a perforated cylindrical band surrounding said first band and having overlapping inner and outer end portions with the inner portion thereof in arcuate registration with the outer of said first portions and overlying the inner portion thereof, headed abrasive prongs extending through said perforations and having- ,their heads held between the bands, and means at the overlapping portions of the second band fasten ing such portions to each other and means adjacent thereto fastening such portions to the inner portion of the first band.

3. An abrasive wheel casing comprising a per- 4 forated cylindrical band having its end portions secured in radially offset relation, a second band within said first band having inner and outer overlapping end portions the inner of which is amxed to the inwardly disposed portion of the first band adjacent the offset and the outer of which is slidably fitted between and for circumferential movement relative to the inner portion of the second hand and the outer portion of the first band, and headed prongs extending through the perforations in said band and having the heads held between the two bands.

4. An abrasive wheel casing adapted for mounting upon a resilient rim and comprising a per- Number forated band having relatively short inner and outer overlapping portions spot welded together along the free edge of the outer portion, an inner band having relatively long inner and outer overlapping portions the outer of which is in arcuate registration with the inner overlapping portion of the first band and adjustably positioned between the outer portion of the first band and the inner portion of the second band, said inner portions being fixed together by spot welding adjacent the free end of the outer portion of the first band, and headed prongs extending through the perforations in the first band with the heads held between the two bands.

5. A casing comprising an outer split band having inward and outward overlapping ends, means permanently connecting said ends together, an inner split band located within the outer band, means permanently connecting one end of said inner band to said inward overlapping end of said outer band adjacent said connecting means first named and at a point spaced inwardly from said end of said inner band whereby said end projects beyond the inward end of said outer band and due tosaid overlap, in spaced relation to the first band to form a channel, and the other end of said inner band being slidable in said channel.

6. A casing for an abrasive wheel comprising a resilient rim, an outer split band having inward and outward overlapping ends mounted on said rim, means permanently connecting said ends together, an inner split band located within the outer band, means permanently connecting one end of said inner band to said inward overlapping end of said outer band adjacent said connecting means first named and at a point spaced inwardly from said end of said inner band whereby said end projects beyond the inward end of said outer band and due to said overlap, in spaced relation to the first band to form a channel, and the other end of said inner band being slidable in said channel.

ALTON E. TOBEY.

REFERENCES CITED The following references are of record in the file of this patent: 4

UNITED STATES PATENTS I Name Date 2,140,831 Ecklund Dec. 20, 1938 464,554 Chester Dec. 8, 1891

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