US2368760A

US2368760A - Grinding roll

Info

Publication number: US2368760A
Application number: US506329A
Authority: US
Inventors: Alfred E Hamilton
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-01-18
Filing date: 1943-10-15
Publication date: 1945-02-06
Anticipated expiration: 1962-02-06

Description

Feb. 6, 1945. A. E. HAMILTON 2,368,760

GRINDING ROLL Original Filed Jan. 18, 1943 2 Sheets-Sheet 1 INVENTOR.

1:. HIM/m Feb. 6, 1945. A. E. HAMILTON GRINDING ROLL 2 Sheets-Sheet 2 Original Filed Jan. 18, 1945 INMENHZQR. flineso ..-Hfimuram nfroplvex Patented Feb. 6, 1945 I Yasea'zso GRINDINGROLL; Alfred E. Hamilton, Pittsburgh, Pa.

Original application January 18, 1943, Serial'No. 472,696., Divided'and this application October 15, 1943, Serial No. 506,329 i i l 7 Claims. 01. 51-194) My invention relates to an apparatus for the surfacing of materials of various kinds, such as strips or sheets of steel, transparent plastic sheets, etc., by grinding andpolishing, the present case being a division of my application Ser. No. 472,696, filed January 18, 1943.

The present invention relates particularly to grinding and polishing apparatu wherein the abrasive or surfacing materials arecontained on sheets or strips that are placed upon surfacing rolls, usually in the form of sleeves that are replaced as they become worn. The sleeve-like or tubular coverings for the rolls are not entirely satisfactory, because the rolls have to be partly or entirely dismounted from the grinding machine, in order to permit replacement when the abrasive becomes worn. Again, it is diflicult to make sleeves always of the precise diameter for accurate fit with the rolls.

One object of my invention is to provide an improved form of surfacing rolls, wherein the surfacing material is contained on strips that are helically wound or wrapped on the rolls.

v Another object of my invention is to provide an. improved manner for detachably fastening abrasive strips on surfacing'rolls.

As shown on the accompanying drawings Fig-.

ure 1 is a side view, partly in section, of apparatus embodying my invention; Fig. 2 is an end view of one of the surfacing rolls of Fig. 1; on an will have sufficientlysnug fit with its hub to maintain it against turning on'the hub under grinding friction and to maintain a helically wound abrasive strip l8 'taut thereon. Also, the pressure can be controllably varied to suit various grinding conditions. For example, a high pressurewill be employed when an intense surenlarged scale, showing the manner in which the abrasive strips are detachably held on the surfacing rolls; Fig. 3 is an enlarged view looking inthe direction of the arrows IIIIII of Fig. 2; Fig.4 is a view taken on the lineIVIV of Fig. 2; Fig. 5 is a projected view showing one of the abrasive strips that are wound on the drum; Fig. 6 is aface-view, On a. reduced scale, showing how the abrasive strip is helically wound on a drum, and Fig. 7 is an enlarged sectional view through a portion of one of the surfacing drums, showing the manner in which an abrasive strip is wound thereon.

The apparatus comprises surfacing rolls 'IO and H between which is passed the strip or sheets that are to be ground and polished. These rolls are mounted on shafts l2 and I3 respectively that are supported'in suitable bearings and frame work, as set forth in my said-application, the shafts bein'g'driven from a suitable source of power. Where only one side of a sheet is to be surfaced, an idlingly rotatable billy roll may be substituted for the roll ll. Each roll comprises a hub portion l4 having a circular 'plate [5 on which is supported a pneumatic drum 16" of rubber or the like, the drum being held in place on the hub by a removable end plate II that forms part of the hub.

'Air pressureis maintained in the annular pace within each pneumatic drum 5, so that it facing. action is required-on a strip or sheet, and

lower ressures for lighter grinding or surfacing operations. The pressure in the rolls may suitably vary from 5 lbs. to 20 lbs. persquare inch,

depending upon the grain\size of the abrasive 'or the nature of the workbcing operated upon.

Each of the roll shafts I2 and I3 has a passageway formed therein that communicates with pipes l9 and 20 respectively, the said pipe of course rotating with the drums and the shafts.

On the shaft l2, stuinng boxes 22 are mounted to scale. header collar 23 in which the shaft'rotat'es. A hose or pipe 24 communicates through the collar 23 with the passageway in the shaft l2. A swiveljoint 25 is provided at one end of the shaft l3so that air flow can bemaintained to 'the passageway in said shaft from a pipe 26,

while the shaft is rotating.

A reservoir 21 is supplied'with air under pressure through a pipe 28, from a suitable compressor (not shown). When it is desired that the pressures in the rolls be identical, air is suppliedfrom'the reservoir 21 past a pressure-reducing valve 29 and through a pipe 30 to the upperdrum, while such supply will be through a pipe 3! to the lower drum. If pressures of'different degrees are required in the upper and lower drums, a valve 32 in the line 3| will be,

closed, and a valve 33in a line 34 will be opened. Thereupon pressure to the lower drum will be through a pressure-reducing valve 35 and through pipes 33 and 26, to the lower shaft l2.

The pressure-reducing valves may be of any conventional form and can beadjusted by their handles 35 and 36, to automatically effect supply of air at a desired pressure tothe drums,'which pressure will ordinarily be somewhat less than the pressure in the reservoir 21. In order to prevent an excess of pressure being developed in the drums, as a result of heat through grinding fric- 't'ion 'or increase of atmospheric temperatures, I

provide pressure reliefvalves 38 and 39 that are adjustable to permit automatic exhaust of air from the, drums at pressures above that at which the air is being supplied past the regulator valves 29 and 34. These valves 38 and'39 may be of conventional form and adjustments are made strips.

strips will be Wider than other strips that may be used on the drums and will, therefore, be wound on a different helical pitch than narrower .Again, some; strips willhav re te stretch than others, under the expansive pressures and centrifugal forces, and this tendency H will vary with the helical pitch at which a strip is wound on the drum. The pneumatic PKQS13F$ must, of course, be sufiicient to prevent displacementof the strip on the drum during grinding operation and still must not-basogreahas n mp5. ture the strip. Reinforcing cords of ,iahnic A are preferably provided in the rubber drums, control the expansion thereof and to assist in maintaining the cylindrical contour of the drum:

In Figs. 2 to 7, I show details of the. manne in which the abrasive .strip 1,8 ;is,,applied. .to -.and connected with the roll. lllsthefabrasiye .strip on the other roll .|.I being pimilaigly. applied The abrasive .strip- 1 8 .-iS ..h e1 i C8i1I y, wound ,upon the; m Ill... This s inma h of water roof sand ape m ry cl thpr the .like.- The-ends -ing, a$1 1 nts ,at annularly spaced points on the ,flQIIQQJQr holding the belt on the said flange.

of thestrip l8aretapered-as at-Ads tn tthe .end. turns, thereof will overliea flange. 45..that, is

formed on the huh, Withoutproiecting .beyondthe flange. The turnslof the-strip will have an Overapp e a ea a 4. andlh uter wall-oi the drum .is helically .grooved. or depressed to ac.- commodate the .doublethickn85 .Qf strip .atAS, ereb p i n I 2 QS11 Il 1lymo0thand continuous ,abr'ading .suliace.. Thiigroove also resists tendency .of the strippturnsto.creepaxial- I 1y. on the drum.

h ds. of the str-i p: 1 8 a de hshahlys e cured to. the annular. flanges. 45 at. the, endsm. the hubs, .by metal. 'strapsfor-hoo s 4L The...ta-

pered ends 44 of the strips are wrappedamund the flanges 4.5 and the straps. pla'cedover the same. The flange &5. is broken. and has .intu med ends at 48 between Whioha portion .of the strap is passed and extends aroundthe .shafl i 1.2 and through'a yoke 49..

A pin .50 extends. throu h 2. Grinding apparatus comprising a surfacingroll, an abrasive strip helically wound on said 'roll, an annular flange extending axially at one endaof: the. roll positipn. to reoeive an end turn of the strip, an endless belt surrounding said end turn and having a looped portion extending through, the flange toward the axis of the roll, means for tightening and anchoring said looped portion'to hold the beltin clamping engagement with the'sa'id-end turn of the stripgand retain- .3; Grindingapparatus comprising a surfacing roll, an abrasive strip helically wound on said.

rollpa-n "annular flange extending'axially at one .endof theroll in positionto. receive .anaendturn of .the.str ip,;a belt-surroundingsaid endturnand having .a, looped portion. extending through he flah e-towa idathe axis .of. the roll, .meansim .anchorinasaid looped portion to .holdjthe belt in clamping engagement with the said-..en dturn. of the. strip, and retaining. elements. carried bythe outermostedg .of .thebelt. .and slidably conneoted to holding elements that. .are carried by vthe flange, wh reby the belt. is. held against.- dislplacementirom the flange but can-have slight sliding .movement thereon. concentrically the .rolla'xis during tensioningof. the .sanieagainst roll having axially-extending annular flanges at itsends, a flexihlev strip .of surfacing .m'aterial surrounding the roll and overlying said flanges.

h -.ehdl urn of h i -i 4. Grinding apparatus comprising a surfacing an endless belt at each end IoftherolL'overlying the saidstrip and holding ittightly onj thefadjae centflange, the helthaving a loopedpqrtionextending throughthe flange, an anchoring. device-carried by the .adjacentend wall .otthe roll and extendin through the looped portionpi the belt, and means v,for.adiosting the .saidnevice radially of the drum, toti'ghten'thebelt.

the legs of the yoke, forsupportinga1; eye \bolt serving. as ,a ,brace to resistmdial.thrnstslonthe "bracket member t2, when the nuts..a.1e.-li2um&d to,. tighten. the strap. 41,; Clip.-like,.elements-. 56

are welded to the edge'oi thenstrapi Aland-file p o ided wi h elon ated. holesi ithrouehwh hh screws 5B,.extend, the inns: ends. 9f the. screws bein .threaded'into the dense. .45. Tha'sorews:

together with thec i s 1.55.. hoid...tne;s mp.

a ainst sliding of the .fiangeufli while the. elone tedholes allow the. necessary .slight. ciroumferential slidin of the strap .4] durin thetieh eningv thereof.

I claim as ,m invention;

1. Grindin apparatus.comprisinga urfacing.

roll, .anabrasive strip helically wo nd id 1, an annular flan e extendin al y at. n end :of the roll, in positionto receive .an endturn of the strip, an .endlessbe lt surrounding; saidend r turn and having a looped portionuii'ttinding 1 throu h theflange toward the axis.of ..the;.r-.oll, andmeansfor tightening and, 'anchoriog'said looped portion to hold the belt clahi h zeugagement with .thesaid endturn .oithelstrips.

, toihold it on theroll; ,a ;-por .tion,.oi eachheltheing .5. Grinding apparatus comprising. .a .surfacing roll, a f exible..,.stri;p.of .suriiacingmaterial surrounding theroll, an. endless belt. at each. end or the roll, overlying edgegportions to. the strip loopedinwardly. toward. the axis of. the n means exte ding throueh'the loopLa-hd adjustable. radially of the. roll, 1 to tighten thegbelt.

fi-rfitin ina pparatus glomprising a surfacing r.ol ,1...s,ecured to a rotatableshaft, .a: flexible strip or ,suriaeing material surrounding vthe .rollll'aii En ess el a ea h. end. .of the- .roll,. overlying edge portions. of the. strip-to. hold .it ontherol l,

3 a portion of .eachbelt beingloopedein wardly.and

.extend ngqaround theflsha ft and alhelt tighten.-

' ingand anchoring: device engaging the innermost portion of the belt and adjustablefradiallygof the hat-tie tighten. thelbelh 1 so '1. fi ind ha ahpa a mm risine a ur acin .rQlLsecu'redtOa rotatable, shaft, a fiexibleastrip oi, surfacing material,,.surrounding. the roll,,.}an endless.- belt-at .eacht-endioi the roll, overlying edge. portionsof the. stripto hold it on the roll,

.a pottion of eachbelt .beinjg. loopedtinwardly and s:xh t le. arch d t e sham. at ittigntje n and, anchoring; devise engaging. innermost portionof the belt and adiusftableradiallyioiflthe shaft, t t hten the. elt. and retaininaelements ca ie b t 1 1] i h it o ea ifll outermost edges. of. :theebeltland prevent lendv'vise displacement. thereottfronnthe 17011....