US1736869A - Abrasive device - Google Patents

Description

N0V- 26, l929 l F. o. ALBERTsoN Er AL ABRAS IVE DEVICE Filed April 41s,4 1927 www f Melina/1( fwwd' QM.

` Patented Nev. 2e, 1929- UNITE-D s'rnxrlazsl PATE-.Nr ori-lcs rnANs o. ALBEa'rsoN AND eUsrAv oLsEN, br sioux crrY, rowA, AssreNons 'rc ALBEivrsoN a COMPANY, me., or sioux CITY, rowA, A coRronA'rIoN or'IowA ABRASIVE DEVICE Application led April 18, 1927. Serial No. 184,476.

The present invention relates to improvements in abrasive devices, being more particularly concerned with grinding wheels which are adapted to be used for smoothing and polishing operations.

`Oneof the objects of our invention is the provision of an abrasive wheel having a padded ri`m with a longitudinal slit therein, which is adapted to permit the application of stantially cylindrical rim 12, a hub 13, and

a web 14 connecting the hub and rim.`

' lhe web 14 is lpreferably not centrally disposed between the edges of the rimf12 in order to provide convenient space for a tightening yoke 15 supported upon the hub 13, and

the rim 12 is providedwith a longitudinal aslot 16 of sufficient width topermit the passage of two layers of thickness of any abraan abrasive band about said rim, with therJ sive band which may be used with the wheel.

ends of the band projecting inward toward the hub of the wheel, together with an eRective tightening device for said band, adapted to permit the quick substitution of anew `abrasive band with a minimum expenditure of time and labor. I Another object of our invention is the provision of an abrasive wheel of the "class described, having a simple and eective band tightening device, comprising means f or holding the ends of the band about a clip, resilient clampin means for clamping the folds of said ban on said clip, a tightening yoke, and a pivotal connection between said ok'e and clip to permit the uniform tensioning of the band upon the wheel.

Another object of our invention is the provision of an abrasive wheel of the class described, which is light, well balanced, dura.-

ble, and which can be economically manufactured.

Other objects andadvaiiiiages of our invention will appear more fully ,from the following description and from the accompanying drawings, in which similar characters of reference indicate similar parts throughout the several views.

i Fig. 1 is -a side, elevational view of our abrasive wheel. f

Fig. 2 is a cross sectional v iew taken, on

the line 2-V-2 of Fig. 1.

Fig. 3 is a detail v1ew,.1n perspective, of

the clip employed in fastening the ends of the band. y

Fig. 4 is a detail view, in perspective, of the resilient clamp employed with said clip.

Fig. 5 is a similar view ofthe fastening pin. Referring to Figs. 1 and 2, 10 indicates, in itsl entirety, our abrasive wheel whichvcomprises a cast metal wheel 1 1 having a sub-` extremely hi yided wi The exterior surface of the rim 12 is vcovered with a layer of heavy felt 17 coniprising a band of felt of a width equal to the width of the rim and of a length sufcient to extend Dfrom one edge of the slot 16 about the rim of the wheel to. the opposite edge of the slot 16.

` The felt bandfl' is tightly stretched about.`

the rim 12 and securedthereto by a pluralit of rows of rivets. .18 passing through the fe t '17 maybe rounded off in'order topresent a rounded surface, labout which the abrasive band .may be bent.

"The web 14 is preferably cut awayl ada@ cent -the inside edge of the rim 12 at the s ot -16 to provide an-aperture20 for the reception of the abrasive ,band tightening device. In

order to balance the wheel dynamically,j a plurality of yother apertures 21 may be made as required in the web, removing sufficient thereof to substantially balance the wheel when the ti htening device of relatively heavier metal is supported thereon.

The wheel 11 is preferably cons cast aluminum in order to provide a very light wheel which is capable o being operated at may be use which is supported by hand.

The hub'13 is provided with an axial bore y 23 vand the hub' is preferably `formed rof greater length upon that side ofthe 'web l which is toward theA center 'of the rim or` wheel tructed of rotative speeds and whichA if desired, upon, apparatus forming. a boss 24, in order to support the i tightening yoke 15. The boss 24 may be pro- Alatsides 25-inyplanes on each sides 10o i of the boss which are parallel to the planepassing through the axis of -the wheel and the slot 16. i The yoke comprises a cast aluminum member of substantially U-shape, having a pair of legs 26 of vsubstantially rectangular cross section and adapted to fit upon the flat sides 25 of the boss 24, to be supported thereon for sliding movement. The juncture of the lo legs 26 on the yoke 15 may be' enlarged to form a head 27, providing an additional thickness for the yoke about a threaded bore 28. The bore 2 8 is adapted to receive a threaded bolt 29 havin a non-circular head 15 3() which is preferablylexagonal, to permit the application of a wrench in any position of the head. l ./u' i The ends 31 of the legs 26 on the yoke may be inwardly turned to provide a stop, limiting motion of the yoke in one direction upon the boss 24, and the inside of each end of the yoke may be curved to ft the contour of the adjacent part of the hub. The ends 31 of the ,Y legs 26 also project parallel toeach other 2li-above the aperture 20 in the rim, the spacing of .the ends 31 being sufficient to receive between them the resilient clamping member 32 and clip 33 of the fastening device. L

Thelength of, the boss 24 is preferably equal to the thickness of the yoke so that the upper surfaces of the boss 24 and 4the yoke coincide, and the yoke may be retained upon said boss by a washer 34 secured upon theY same by a hollow bolt 35 having a head 36'.`

35 4The hollow bolt 35 may have a threaded bore 37 in such manner that the bolt and bore may f provide a convenient fastening means for clamping the hub upon any actuating member such as a shaft. v

The web 14 may also be provided with a slightly projecting. concentric boss 55 about the boss 24 which is adapted to provide a guide for the yoke 15. Y The abrasive means employed with ou wheel preferably consists of av band 38 ofV paper or fabric, such as emery cloth or sandpaper, preferably the former, having its exterior surface covered with a multiplicity of sharp, projecting grains. The band 38 passes n V about the entire rim 12 upon the layer of felt 17, havin both ends projecting inwardat the slot 16 w ere they are secured to afastening device further to be described. The band employed is preferabl of the same width as the rim ofthe wheel b width if desired.

The fastening device .for he ends band 38 comprises a clip 33, hown in detail in Fig. 3, a resilient clamp 32, shown in de- P9 tail in Fig. 4, and a pin 39, shown in Fig. 5.

The clip 33 comprises a flat sheet'of. metal, .preferably steel which is bent back upon itself to form a double layer, :is at 40, after which the upper ends of theplate are again folded v 05. back in substantially U-shape, forming downut may be of augreater 'of' the wardly turned lflanges 41. The iianges 41 arev spaced from the double layer 40 a distance sufficient to receive a single layer of the abrasive band and the lower end of the doublef layer is provided withan aperture 42 adapted to receive the pin 39. The metal on eitherside of the aperture 42 may be cut away, as at 43, toreduce the weight of the clip and to re are spaced sufficient to receive the lower end" 0f the double layer 40. The flanges 45 are "then bent outwardly, as at 46, curved in, as at 47, and finally curved outward, as at 48, at

their edges to provide a resilient clamp which will fit .upon the clip 33, having fingers 49 upon each side ofthe clip which are adapted to press against the same.

The ranges 45 are likewise pmvided with Varl-aperture 50 whichis adapted to register with the aperture 42`iof the clip when in assembled relation and to receive the pin 39. The thickness of thehcombined clamp and clip at its lower end, adjacent the apertures 42 A and 50, is slightly less than the distance between the ends 31 of the yoke, and the ends 31 of the yoke are likewise provided with an apertnre 51' which mav'be made to register with the apertures 42' and 50. The pin 39 may then be passed through the ends of the yoke, as well as the resilient clamp 32 and theclip 33, thereby pivotally fastening these members together, the pin being retained in such position by the shearing force placed -onthe pin when the tightening'device is drawn up. t

The pin 31 comprises an ordinary steel pin,

having a knurled head 53 for convenient gripping by thelingers and a rounded end .54. which 'is adapted to aid in its insertion Vthrouglti the fastening device.

The assembly of the foregoing parts is as follows: Y

The abrasive band 38 may be formed into substantially cylindricalshape with its ends inwardly turned as they would be disposed in the slot'16. Each end of the band is then folded upward and placed between the downwardly turned flanges 41 and the body of the clip 33.

in the clip 33, the ban being folded upward about the end 52 of the flange 41 in position to pass Vout at the slot 16 of the wheel, With both ends of the band disposed in this position, the resilient clamp 32 is forced upon the clip 33, the fingers 49 pressing the folds of the band 38 againstthe flanges/41. The resilient clamp 32 having been adjusted with' its aperture 50. aligned with the aperture 42 of the clamp, the inwardly turned ends ofthe The band 38 will th n have its end disposed- 3.8 may be slid laterally into the slot 16, .and at the same time the balance of the band will easily slide Vabout the 'felt covered rim 12 of the wheel. ,7

The bolt 29in the head 27 of the yoke -may be withdrawn until the yo'ke is moved toward the fastening-device so that the aperture 51 in the yoke may be aligned with the .apertures 42. and 50 of the fastening device. .The pin 39 may then be passed through the-ends. of

,the yoke, the resilient clamp and the clip,

thereby pivotally fastening these parts to- .gether, andl the band 38 may be tightened by screwing in the bolt 29. i,

The bolt 29 will bear against the boss 24,

forcing the yoke downward, in Fig. 1, and

a simple and edective fastening means for they ends of the abrasive band by simply folding such ends about the flanges of the `the adjacent portions of the band 38 against clip and pressing-them against said flanges.

.This fastening device requires no holes in the abrasive band, nor any bolts norscrews t0 fasten the`ends of the abrasive band. J

The employment .of a simple pin connection between the yoke and fastening device likewise enables':-the detachment of these parts without the application of specialtools, and

t ie only point at which a wrench or tool -must' be employedis in the operation of the bolt 29j which tightens the band. Y Y

The narrow slot 16 likewisetends to press the ianges 41 when these partsl are tightened,

and the narrowness ofthe slot also rendersthe rim of the wheel practically continuous'.l i It will lthus be observed that we have-in# vented an abrasive wheel which'is vwell balanced,light anddurable, and which comprises afasten-ing device for an abrasive band which is readily and quickly detachable for lthe substitution of a new bandv without loss. et time or'labor.A

` Our` tightening device is also adapted to `I Y draw lin both edges of the band lwith equal force. thereby uniformly stretching the band.

upon all parts of the rim of the wheel.

Whllewe have illustrated and described a specific embodiment of our invention, many v the appended claims.

modifications may be made without departing -from the 'spirit of the invention, andwe d0 not wish to be4 limited 'to the precise details of f construction set forth butdesire to avail ourselves of'all changeswithin the scope of We claim.: y Y 1. In an abrasive-device, the combination said rim having a longitudinal slot through the same, with anabrasive bandy extending about said' rim and having its ends projecting through said s lot, securing meansq for the ends of said band, and tightening means comprising a yoke slidably engaging said hub, a screw bearingV on sald hub and a removable. pin pivotally connecting said yoke and securmg means.

2. In' an abrasive device, the combination of a\metal wheel comprising a hub, a rim, and means supporting said rim on said hub, said rim having a longitudinal slot through the same, withan abrasive band extending about said rim and having its ends projecting through said slot, securing means for the ends of said band, tightening means com.-

Vprising a yoke slidably mounted on said its rim andextending through a slot in said rim withv means for securing` one endof said band, means for securing the other end of said band comprising asheet metal member having a backwardly turnedflange, said end passing over'said fiange, bending aboutv'the end thereof and lying'between said liange and member, a spring clip clamping said band `against said flange, and means for tightening said band. A

Y 4. In an abrasive device, the combination of a wheel havin band means for securing the other end of said band comprising a sheet metal member having a backwardly turned flange, said end passing over said flange, ,bending about the en d`thereor` and lying between said flange and member, a s ring. cli band against said ange, an means for tighteningsaid band comprising a yoke passing about a hub on said wheel, a'4 screw bearing against said hub, and a pin passing through thends of said yoke and said sheet .metal member and spring clip. v

-5. In an'abra'sive device,the combination of an abrasive band and means for removably securing the ends of lsaid band toa tightening device, said means) comprising a sheet .metalmember bent back upon itself` an abrasive bandabout its rim and exten ing through a slot 1n said rim with means for securing one end of said clamping said the opposite direcotion from said flange, and removable clamping means for holding said band folded about said flanges. Y i

. 6. ln an abrasive device, the combination of an abrasive band and means for removablyY securing the ends of said band to a tightv of said sheet metal member, and being folded about the end of a flange extending in the opposite direction ,from said flange, removable clamping means for holding said band k folded about said flanges, and means for connecting said first-named means to a tighten-h ingl device comprising a pin loosely. passing through said sheet metall member, clamping means'and device. 7. In an abrasive Wheel, the combination of a Wheel having a hub, rim and .means to join said huband rim, said rim havin a longitudinal slot, with an abrasive ban about said rim with its ends passing through said slot, erband tightening device slidably mounted on said hub, and a quick detachf able connection between the ends of 'said band and said device, said connectionl including means for folding the ends of the band about a securing member, and resilient means to hold said ends in folded condition.

8. In an abrasive device, the combination o'f a slotted sup ort having a hub with an v abrasive band a out said support and exsaid band about said support comprising a l 4o-V tending into said slot, means forktightening member slidably engaging about said hub, and a separate spring clip detachably secured to said member and adapted to receive backwardly turned ends of s aid bad to receive the same to said member.

9. In an abrasive wheel, a securindg device i comprising a metal member Vforme with a pair Vof backwardly extending flanges spaced from the bod)7 of said member to receive theends of a band folded about said flanges, and resilient-means carried b said bod)7 for pressing said band about said iianges.

n witness whereof, We hereunto subscribe i ournames this 14th day of April, 1927.

y FRANS O. ALBERTSON.

GUSTAV OLSEN.

Images