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US2842902A - Non-rigid rotative abrasive structures - Google Patents

Non-rigid rotative abrasive structures Download PDF

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US2842902A
US2842902A US710837A US71083758A US2842902A US 2842902 A US2842902 A US 2842902A US 710837 A US710837 A US 710837A US 71083758 A US71083758 A US 71083758A US 2842902 A US2842902 A US 2842902A
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Prior art keywords
abrasive
annulus
sections
wheel
flap
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US710837A
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English (en)
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Theodore J Miller
Earl L Gothier
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3M Co
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Minnesota Mining and Manufacturing Co
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Priority to CH359376D priority Critical patent/CH359376A/de
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Priority to US710837A priority patent/US2842902A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/04—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising a plurality of flaps or strips arranged around the axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/20—Mountings for the wheels

Definitions

  • the present invention relates to new and improved rotative abrasive structures comprised of an annulus of radially extending juxtaposed flat sections of abrasive sheet material.
  • Abrasive belts have seen extended use in operations where it is desirable to remove stock rapidly, particularly where fiat or nearly flat surfaces are being abraded. By their very nature, however, abrasive belts are not very satisfactory where workpieces have extreme curved surfaces. Where surfaces of slight curvature are being abraded, belts are occasionally used in conjunction with contact or back up wheels having special irregular peripheral shapes. However, such use necessitates a specially shaped contact wheel for each type of article abraded. Belts are further disadvantageous where employed to abrade workpieces which have wide curved surfaces. The belt edges have a tendency to gouge and scar the workpiece making special finishing operations necessary to insure that gouge or scar marks which would appear after the article has been plated, painted, etc., are removed.
  • abrasive setup wheels are most generally employed followed by a buffing operation.
  • Set-up wheels are cloth buffing wheels to the peripheral surfaces of which have been bonded abrasive grains. The grains are bonded to the surface of the cloth by means ofan adhesive binder which has been hardened or set-up. A wheel having a hard rigid surface results.
  • the abrasive coat is hammered to break up the, surface into discontinuous clumps of abrasive and binder adhered to the cloth so as to render the. abrasive coating somewhat resilient and yieldable to the contours of the workpieces.
  • the hammering or breaking up of the abrasive coated surface to render the wheel suitable also reduces the useful life of the wheel.
  • such setup wheels must be replaced every 30-40 minutes. Costly work-stoppage and down time results which raises substantially the cost of abrading and finishing operations employing such wheels.
  • sisal buffs cloth bufling wheels containing layers of rope fibers
  • abrasive compounds are added to the surfaces of the buds during the operations, and serve asv the primary abrasive component.
  • Such operations are 2,842,902 Patented July 15,
  • the present invention provides novel improved structures which obviate disadvantages heretofore known in the abrading and finishing art. It provides structures which accurately rapidly abrade workpieces having extreme curved irregular surface contours while eifecting fine finishes thereto, irrespective of workpiece dimensions. Yet the structures hereof are also convenient to handle, install and replace and are operated without need of special operating equipment. In addition, the abrasive structures have long useful abrading lives so as to decrease to a minimum the necessary costly down time in abrading operations. Our invention further provides novel methods whereby our abrasive structures may be utilized to the peak of their efiiciencies, and also provides,
  • Figure 1 is a plan view of an abrasive sheet flap section employed in an abrasive wheel structure of the present invention
  • Figure 2 is an exploded view in perspective showing the manner in which an abrasive wheel structure of the present invention, shown partly in section, is mounted for operation;
  • L Figure 3 is a mid-section view of the assembly of Figure 2 which has been employed in an abrading and finishing operation;
  • Figure 4 is a schematic view of a portion of an automatic abrading and finishing operation employing an abrasive wheel structure of the present invention.
  • Figure 5 is a perspective view, partially cut away, of an alternative abrasive wheel structure embodied in the present invention.
  • a unitary abrasive wheel structure is formed, in a manner hereinafter to be described, of an annulus of many radiall extending juxtaposed flap sections 10 previously die-cut in the configuration shown in Figure 1 from coated abrasive sheet material.
  • Adjacent flap sections 10 in the annulus are firmly rigidified and adhesively bonded together over a substantial area 11 at the radially inner portions thereof, which area extends across the entire width of the sheet and for a substantial distance, at least about 4 inch, radially outward from the inner edge of the sections.
  • the annulus is provided with a strong rigid reinforced inner rim.
  • the several flap sections 10 are positioned such that the abrasive surfaces thereof extend in the same direction around the wheel structure with the abrasive surface of one section facing the back surface of the adjacent section.
  • the generally rectangular flap sections 10 each have a pair of opposed notches 12 and 12a (Figure 1) extending inwardly from the lateral edges near one end thereof.
  • a second pair of opposed notches 13 and 13a extends inwardly from the lateral edges of the flap section adjacent the first mentioned notches 12 and 1212, respectively, to a depth somewhat greater than that of the latter.
  • the portions of the flap sections extending between the notches 12 and 13 and between notch 13 and the end of the section terminate identically short of an extension line of the lateral edge of the flap section.
  • the similar protrusions on the opposite edge of the flap section terminate short of the lateral edge extension.
  • notches 12 and 12a of the several flap sections 10 align to define opposed outer circular grooves 14 and 14a, respectively, in the lateral surface of the annular structure near the inner periphery thereof; notches 13 and 13a similarly align to define inner circular grooves 15 and 15a, respectively.
  • the abrasive wheel structure is conveniently mounted for rotation on and with a shaft as shown particularly in Figure 3.
  • a cylindrical hub 16 having an outer diameter slightly smaller than the inner peripheral diameter of the abrasive annulus and a width equal to the width of the latter at its inner periphery, is inserted into the center hole of the annulus.
  • flange 17a having laterally extending rings 18a and 19a is afiixed the other end of hub 16 with the said rings being snugly received by the grooves 14a and 15a, respectively.
  • flanges 17 and 17a are in position, their exposed side surfaces fit approximately flush with the lateral surfaces of the abrasive wheel due to the previously noted configuration of the flaps 10.
  • the grooves in the structure as defined by the notches in the individual flap sections 10, and, correspondingly, the rings of the flanges 17 and 17a are rounded out.
  • a cylindrical bushing 21 extends through the flanges 17 and 17a and the hub 16 and terminates flush with the exposed surfaces of the flanges.
  • the bushing 21 receives a partially threaded shaft 22, the entire wheel assembly being affixed thereon by means of a pair of internally threaded hexagonal-head nuts 23 and 23a which are turned onto the shaft 22 and brought up tight against the flanges 17 and 17a.
  • a specific abrasive structure like that described is comprised of 850 abrasive sheet flap sections having a width of 4 inches and a length of inches, the notches being positioned in the end one inch of the. flaps.
  • the abrasive sheet material consists of grit 180 coated abrasive sheet material in which the abrasive particles are adhered to a drills-cloth backing sheet by cured phenolaldehyde bond and sandsize adhesive coatings.
  • the annulus of radially extending flap sections has an outer diameter of 16 inches and an inner diameter of 6 inches.
  • Each of the several flap sections is rigidified at the inner end and rigidly and firmly adhered to adjacent sections with a cured epoxide resin composition consisting of the reaction product of Bis-phenol A and epichlorohydrin, having an epoxy number of approximately 192 grams per epoxide equivalent and a hydroxy number of 80 grams per hydroxy equivalent (sold under the trade name of Bakelite BR18774), accelerated with diethylene triamine, the ratio of resin to accelerator being :1.
  • An area of the entire width of each flap section on each surface thereof was covered with the adhesive for a distance of at least inch from the radially inner end.
  • the peripheral surface actually takes the contour of the articles being abraded.
  • This feature permits large areas of irregularly shaped workpieces to be evenly abraded in a single pass.
  • the abrasive flap sections 10 of the abrasive structure are seen to have taken the contour 24 of a workpiece during an abrading and finishing operation.
  • FIG. 4 One application in which the structures hereof have seen extended use is shown in Figure 4, the automatic abrading and finishing of the broad side surfaces of auto mobile bumper-guards being illustrated.
  • An abrasive wheel assembly, or abrasive head 30 is mounted on a shaft 31, the latter being rotatably atfixed the end of platform 32 and driven in the direction of the arrow by suitable means such as an attached electric motor, or a motor and belt assembly (not shown).
  • Platform 32 is pivotally mounted about an axis 33 permitting the abrasive head to be raised and l wered.
  • a counterweight 34 slidably attached to the other end of the platform 32 decreases the force exerted by the abrading head due to its own weight against workpieces, here bumperguards 35, which pass under and in contact therewith.
  • the abrading force may be varied by sliding the counterweight 34 on the platform 32.
  • Supports 36 carried by a conveyor 37 which travels in the direction shown by the arrow, support and retain the bumperguards 35 in position during the operation.
  • bumperguards 35 In passing into contact with, under and beyond the abrasive head 30, the forward edge of bumperguards 35 engage the rotating wheel, and as the bumperguards 35 advance, the wheel is raised, platform 32 being pivoted about axis 33, due to the upward force exerted thereagainst by the advancing increasing height of the bumperguard surface. As the article passes under and beyond the abrasive head 30, the latter is lowered again. A suitable stop, not shown, supports the platform with the head St) in position for the next cycle. Thus, the bumperguard 35 is'contacted by the abrasive wheel over substantially its entire length.
  • the 16 inch diameter, 4 inch wide wheel structure above described was assembled, the flanges being 8 inches in diameter, andemployed with similar structures in the above described bumperguard abrading and finishing operation.
  • the counterweight 34 was adjusted such that the force exerted by the wheel against the 'bumperguards was 12 pounds. Conveyor speed was such that bumperguards passed under the abrasive head at the rate of 600 per hour. Preliminarily, several bumperguards were passed under the new wheel structure rotating at 1850 R. P. M. in order to impart the surface contour of the bumper guards thereto. After about 5 minutes time, during which about 50 articles passed in contact with the wheel, the wheel periphery had taken the contour of the guards such that nearly the entire side surfaces of the bumperguards were abraded in a single pass.
  • the abrading life of the contoured abrasive wheel structures was found to be about 3000-4000 bumperguards. That is, after abrading about this number, the flap sections on the wheel were worn down nearly to the rigid inner rim portion of the wheel. This necessitated about 5 minutes down time every 5-6.7 hours for replacement of the wheel. Such an abrading life is highly satisfactory compared to the lOminutes down time required every 40-45 minutes for set-up abrasive wheels in identical operations. Yet, surprisingly, we found that upon increasing the rotative speed of our abrasive structures about percent, or to about 2200 R. P.
  • the abrasive articles were seen to emit threads and pieces of the abrasive sheet flap sections of which the wheel structures were composed. This shredding of the individual flap sections occurred particularly as the bumperguards initially contacted the wheels.
  • the rotative speed was increased the shredding gradually diminished and at 2200 R. P. M.and beyond, no direct visual evidence of shredding could be seen.
  • the abrasive articles of the present invention have: been employed with similar success in many abrading and finishing operations. For example, they have been employed in grinding and polishing of jet aircraft engine blades in which extremely high precision is necessary, in the removing of rough scale resulting on iron and steel pieces from rough forging and particularly on flat plates (which, .incidentally, is accomplished only poorly or notat all with abrasive belts), in the polishing of glass and for many other applications.
  • the critical range is lower in a given operation where a large wheel with a relatively large inner diameter is employed and/ or where relatively stiif abrasive sections are employed than in the converse case.
  • the range at which the characteristics undergo the change may be visually determined by the wheel shredding observed.
  • the 16 inch diameter wheel structure containing 850 flap sections (grit 150). previously described was prepared as follows: The previously die-cut flap sections 10 were assembled in face-to-back relation in an elongate chan-' nel member of U-shaped cross section. The flap sections were arranged with the ends adjacent the notches extending upwardly. The row of flaps was then compressed together. The compressive force was then released somewhat permitting the flap sections to spread apart slightly and a one-half inch wide strip of pressure sensitive adhesive'coated masking tape was applied along each edge of the top surface of the block of slightly spread sections.
  • the block of flap sections was then removed from the channel, the individual flaps being adhered to and bound by the tape strips, and manipulated into an annulus by bringing the end flap sections together with the tape strips on the inside.
  • An 8 inch diameter steel forming ring was then temporarily driven into the radially outer lateral groove on each side of the structure to perfect the uniform annular shape thereof and compress the radially inner portions of the flap sections together.
  • the two strips of tape were then removed from the inner peripheral surface. While the annulus was laid on a side, additional adhesive resin was poured into the radially inner groove on the exposed surface to insure adhesive impregnation entirely across the structure. Simultaneously,
  • the structure total about 5 ounces.
  • the wheel was then stored at room temperature for 12 hours while the adhe sive resin cured to rigidly unify the structure and adhere About 2-3 ounces of additional adhesive resin was utilized in these latter applications, making the amount of adhesive employed in' tion.
  • the temporary steel forming rings were then removed, the grooves were cleaned out with coated abrasive paper to remove excess resin and permit close fit of the flanges 17, 17a, and the article was boxed ready for shipping as a unitary article of commerce to he later mounted for operation on a hub assembly.
  • the amount of adhesive resin employed was sufficient adequately to bond the flap sections without having adhesive excess flow from the structure during application.
  • the amount of adhesive necessary to adequately bond the flap sections and form the rigid inner rim portion without adhesive excess will vary for structures of different dimensions, abrasive grit size, etc., the five ounce quantity shown being merely that required in the specific illustrative example.
  • the rigid inner structure provided in the structures hereof by the unifying adhesive is particularly important in preventing flap sections from being axially buckled or compressed upon subjection tosevere working stresses.
  • the unifying adhesive extended radially at least about 7 inch from the inner periphery and continuously across the width of the wheel structure of the preceding specific example. Near the wheel sides, penetration was somewhat greater than 5 inch due to that adhesive resin which had been added from lateral grooves as is shown in Figures 2 and 3.
  • the minimum radial depth to which the unifying adhesive must penetrate in order to sufficiently rigidify the structure is about inch. Where the penetration is less than about this depth a weak spot exists in the structure at which point individual flap sections can buckle during operation causing failure of the structure.
  • each flap section is n'gidified as above stated by the adhesive, the necày rigidity is present in the inner rim portion of the assembled wheel even though a few flap sections are not adhered to adjacent sections on both surfaces thereof, in which event the wheel structure is in more than a single unitary segment.
  • the centripetally reinforcing side members e. g., ring containing flanges, holding the segments together
  • the rigid inner rim portion of our abrasive wheel struc tures may be still further rigidiflcd by adhesively imbedding one or more annular reinforcing inserts, made, for example, of glass fiber reinforced plastic, in the interior of the inner rim. portion. identically positioned small notches in the individual flap sections at the flap ends which will become the inner periphery of the wheel structures. The notches align to define a groove into which the annular reinforcing insert is positioned as the structure is formed into an annulus. When firmly rigidly adhered in position, the reinforcing insert structurally cooperates with the rigid inner rim portion to even more firmly rigidify our wheel structures.
  • annular reinforcing inserts made, for example, of glass fiber reinforced plastic
  • inserts are to be used only in conjunction with, not as a substitute for, the rigid inner rim portion formed of adhesively iigidified adhered flap sections.
  • end grooves may be filled with resin and thus serve the additional function of facilitating deep penetration of the resin around the grooves.
  • a pack or block is formed of many flap sections of abrasive coated sheet material assembled in superposed This may be done by forming face-to-back relation.
  • Theflap sections previously are die-cut to identicalrshape, having a single pair of opposed notches in the lateral edges adjacent one end thereof.
  • the said notches align to define opposed grooves in the lateral surfaces thereof.
  • the block of flap sections is then compressed in the longitudinal direction'to provide adense distribution of flaps, a typical pressure being about 35 pounds per square inch.
  • the block or packof flaps is so compressed that the portion thereof containing the lateral grooves is exposed and accessible.
  • An elastic member of continuous length e. g., a conventional so-called rubber binder, of suitable length is stretched over and about the periphery of the block, generally in a plane perpendicular to the flap sections.
  • the elastic member is then released so as to nestle tautly in place along and within each of the lateral grooves and about the exposed surfaceof the flap section at each end of the block. Thereby the block is unified temporarily. Then, with the ends of the flap sections adjacent the saidnotches forming the inner periphery, the
  • block of flaps ismanipulated into an annulus with the flap section at each end of the block being brought into face-to-back abutting relationship.
  • This manipulation may involve somewhat of atrick; but it will be observed that if the ends of the block are grasped with the hands, without immediate concern for the mid-portion of the block, and if said ends then are quickly brought around toward one another in a generally circular arc the annulus is formed without mishap.
  • Theforming oper ation. is conveniently conducted with the block of flaps lyingon itsside on a flat supporting surface.
  • the elastic member is cut free from the groove. at the opposite surface of the flap wheel. With care being taken not to disrupt the packed annular relationship of the flaps, the elastic member is pulled free of the annulus. Since the side flange was only driven, lightly into place, thebinder will pull free of the groove into which the side flange was inserted.
  • a second flange like the first, is then firmly driven into position in the, lateral surface of the wheel opposite that retaining the first flange. Following this it may be advisable to invert the wheel and again drive the first applied flange so thatthe lateral ring of the latter will set more deeply into the groove now free of the elastic member.
  • the flanges serve to retain the radially extending flap sections firmly in uniform densely packed relation at the inner peripheral portion of the annulus pending incorporation of the resinous adhesive material between the flaps.
  • the flap annulus is then mounted for rotation on a horizontal axis, the speed ofrotation preferably being controlled through a variable speed drive mechanism. Mounting is such that the center hole of one of the side flanges is accessible for the flowing or pouring of adhesive into the central portion of the flap wheel.
  • the flap wheel annulus can he clamped from one side in a horizontally rotatable jaw mechanism which grips the peripheral portions of the flap wheel side flanges thereby retaining the flap wheel on a horizontal axis while leaving the center portion of one flange accessible.
  • the annulus is rotated, and during such rotation the liquid curable adhesive resin is added, for example through a pour tube, through the center hole of the annular side flange into the space in the center of the flap wheel defined therebetween.
  • the liquid resin thus flows onto the inner periphery of the abrasive annulus Q temporarily forming a pool at the lowerportion of the cavity defined by the inner peripheral portion of the annulus and the side flanges.
  • Rotation is at a speed sufficient for centrifugal forces to cause the liquid resin to flow or seep radially outwardly between the wheel flaps. In this fashion the flow of the liquid resin radially outwardly will be uniform all about the inner circumference. Rotation at the initial rate is continued at least until most or all of the resin pool has disappeared.
  • speed and the duration of rotation should be so limited that the resin is retained at the inner peripheral portion of the abrasive annulus rather than being thrown to the outer portion of the annulus.
  • speed of rotation is then reduced to a rate at which the resin no longer is forced radially outwardly between the flaps, rotation at this slower speed continuing until the adhesive resin has cured to at 1east:a non-flowable state.
  • Heat may be advantageously applied to facilitate the cure-time of the resin and to improve physical characteristics of the thus cured adhesive.
  • This heat source may be employed in the form of a cartridge heater of suitable diameter, the heater being inserted through the center hole between flanges into the cavity.
  • period of rotation at the greater rotative speed may be required in the case of a more viscous adhesive resin or in the case of a fine abrasive grit-size than where a more thinly fluid resin or a coarse abrasive grit-size is utilized.
  • Time of rotation at the final (i. e., slower) rotative speed largely will be governed by the curing time of the resin, a shorter time generally beingrequired in the instance of a rapidly curing material than in the case of a slowly curing resin.
  • the flap wheel structure When manipulated into an annulus the flap wheel structure had an outer diameter of 6 inches, an inner diameter of 1% inches and a width of 2 inches.
  • the annulus was rotatably mounted and then rotated at a speed of-aboutl40 R. P. M.
  • One and one-half ounces of curable liquid epoxide-type resin adhesive like that described inconnection with the'previous example (diethylene triamine accelerated Bakelite BR-l8774), were added to the inner periphery of the flap wheel through the center hole in one,side flange. Following the addition of the resin a three fourth inch diameter 700 F.
  • the rotationalspeed, time of rotation, etc. employed in the case of the specific wheel just described may or may not be theoptimu rn values for the manufacture of flap wheels of different size, different numbers or types of abrasive flaps, different adhesive resins, etc.
  • the initial rotational speed utilizedwgenerally will be less than that shown.
  • the rotative speed will be greater since such viscous resin is less aifectedgenerally by centrifugal force of given magnitude 'than is a'more thinlyfluid resin.
  • the abrasive of the flap sections is of a fine grade, such that the interstices between the abrasive particles andbetween adjacent flap sections are relatively small, a greater rotational speed will be required to cause proper distribution of adhesive resin than where the flap sections contain a coarse abrasive material. Also, a longer also has characteristics which render it attractive as a method for preparing larger wheels. It can be used for making wide wheels as well as narrow wheels. This method has several further advantages. For example, no temporary application of primer adhesives, tapes, etc., to the assembled block of flaps is required. Instead only a single resin adhesive application is necessary.
  • a further advantage is that the flanges employed in the manufacturing procedure need not be removed prior to the time the wheel structure is shipped in commerce, butinstead may form a part of the completed wheel, being of such configuration as to be mountable on a drive shaft. It is to be noted that whereas the elastic member was removed during the course of manu facture this is not vitally necessary, particularlyin the case of coarse abrasive flap Wheels. Further, even where it is desired to remove the elastic member, the same need not be cut away. It can, if desired, be removed by solvent, as, for instance, where the resin employed exists a solvent action on the elastic member. Other rigidifying and unifying resins than cured epoxide resin compositions may be employed in the abrasive structures hereof.
  • resins which cure to a strong rigid adherentstate from a liquid stage such as polyester resins, alkyd resins, phenolic resins and other similar adhesive materials well known to the art are also useful. It is not necessary that two grooves be present on the lateral surface of our abrasive wheel structures in order to provide means for the prevention of radial expansion due to centrifugal forces. Lesser or greater numbers of grooves may be employed; in fact, no grooves need be present at all. In Figure 5, a wheel structure is shown having no lateral grooves.
  • Theannulus formed of radially extending juxtaposed abrasive flap sections 40 rigidified and adherently bonded together into a rigid inner rim section byrigid unifying adhesive 41 is pro vided with a depression 42 at the inner portion of each lateral surface.
  • centripetal reinforcing washers 43 (only one shown) which may consistof glass reinforced plas: tic,.metal or other substance of high tensile strength, are adhered to the lateral surfaces of the inner rim portion in the depression 42 by means of an adhesive of high shear strength.
  • the structure is then mounted on a hub assembly and placed, either singly or multiply, on a shaft for rotation. Any suitable adhesive is employed, in many instances this adhesive being the same as that employed for the rigid unifying adhesive 41.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of abrasive sheet material, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at the inner peripheral portion of the latter with adjacent sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about A inch across the entire width thereof to form a rigidly reinforced inner rim in said annulus.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of adbrasive sheet material having in their lateral edges near the radially inner ends thereof at least one pair of opposed notches which align to define correspondingly at least one pair of opposed axially centered grooves in the lateral surfaces of said annulus, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at the inner peripheral portion of the latter with adjacent flap sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about inch and across the entire width thereof to form a rigidly reinforced inner rim in said annulus.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of abrasive sheet material having in their lateral edges near the radially inner ends thereof two pair of opposed notches which align to define two pair of opposed axially centered grooves in the lateral surfaces of said annulus, said sections being uniformly distributed about the central axis of said annulus and being in dense 1y packed relationship at the inner peripheral portion of the latter with adjacent flap sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about 4 inch and across the entire width thereof to form a rigidly reinforced inner rim in said annulus.
  • An abrasive wheel structure comprising an an nulus of many juxtaposed radially extending flap sections of abrasive sheet material, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at'the inner peripheral portion of the latter with adjacent flap sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about inch across the entire width thereof to form a rigidly reinforced inner rim in said annulus, said flap sections further having in their lateral edges near the radially inner ends thereof at least one pair of opposed notches with corresponding notches aligning in said annulus to define correspondingly at least one pair of opposed axially centered grooves in the lateral surfaces of said inner rim.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of abrasive sheet material, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at the inner peripheral portion of the latter with adjacent fiap sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially out- 12 wardly from the inner ends of said sections at least about A: inch across the entire width thereof to form a rigidly reinforced inner rim in said annulus, said flap sections further having in their lateral edges near the radially inner ends thereof two pair of opposed notches with corresponding notches aligning in said annulus to define two pair of opposed axially centered grooves in the lateral surfaces of said inner rim.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of abrasive sheet material, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at the inner peripheral portion of the latter with adjacent'sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about A inch across the entire width thereof to form a rigidly reinforced inner rim in said annulus, and an annular side member afiixed to each lateral surface of said wheel.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of abrasive material, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at the inner peripheral portion of the latter with adjacent flap sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about A inch across the entire width thereof to form a -rigidly reinforced inner rim in said annulus, said fiap sections further having in their lateral edges near the radially inner ends thereof at least one pair of opposed notches with corresponding notches aligning in said annulus to define correspondingly at least one pair of opposed axially centered grooves in the lateral surfaces of said rim, and affixed to each lateral surface of said rim an annular side flange having a laterally protruding'ring extending into one groove of said pair of grooves.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of abrasive sheet material, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at the inner peripheral portion of the latter with adjacent flap sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about /4 inch across the entire width thereof to form a rigidly reinforced inner rim in said annulus, said flap sections further having in their lateral edges near the radially inner ends thereof two pair of opposed notches with corresponding notches aligning in said annulus to define two pair of opposed axially centered grooves in the lateral surfaces of said inner rim, and affixed to each lateral surface of said rim an annular side flange having a pair of concentric laterally protruding rings each extending into one of said grooves.
  • An abrasive wheel structure comprising an annulus of many juxtaposed radially extending flap sections of abrasive sheet material, said sections being uniformly distributed about the central axis of said annulus and being in densely packed relationship at the inner peripheral portion of the latter with adjacent sections being rigidified and firmly rigidly adhesively bonded together over an inner end area extending radially outwardly from the inner ends of said sections at least about inch across the entire width thereof to form a rigidly reinforced inner rim in said annulus and a centripetal reinforcing washer firmly adhered to each lateral surface of said rim by means of a high shear strength adhesive.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US710837A 1955-11-07 1958-01-24 Non-rigid rotative abrasive structures Expired - Lifetime US2842902A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH359376D CH359376A (de) 1955-11-07 1956-11-06 Schleifvorrichtung, Verwendung der Schleifvorrichtung und Verfahren zu ihrer Herstellung
US710837A US2842902A (en) 1955-11-07 1958-01-24 Non-rigid rotative abrasive structures

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US359376XA 1955-11-07 1955-11-07
US846568XA 1955-11-07 1955-11-07
US710837A US2842902A (en) 1955-11-07 1958-01-24 Non-rigid rotative abrasive structures

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004373A (en) * 1960-03-14 1961-10-17 Norton Co Abrasive devices
US3028709A (en) * 1959-12-14 1962-04-10 David S Hedden Flexible abrasive wheel manufacture
US3078624A (en) * 1958-07-25 1963-02-26 Osborn Mfg Co Rotary abrading tool
US3099113A (en) * 1961-01-18 1963-07-30 Formax Mfg Corp Work wheel
US3134202A (en) * 1962-01-11 1964-05-26 Harry H Hoefler Abrading apparatus for rotary cleaning operations
US3191350A (en) * 1963-01-08 1965-06-29 Schaffner Mfg Company Inc Polishing apparatus
US3206786A (en) * 1959-07-16 1965-09-21 Schaffner Mfg Company Inc Buffing wheel
US3206894A (en) * 1959-04-29 1965-09-21 Schaffner Mfg Company Inc Polishing wheel
US3212219A (en) * 1962-01-17 1965-10-19 Merit Products Inc Method of fabricating abrasive leaves
US3406488A (en) * 1965-09-23 1968-10-22 Minnesota Mining & Mfg Abrasive flap wheel
US3462888A (en) * 1967-01-24 1969-08-26 Schaffner Mfg Co Inc Polishing wheel and method for producing such wheel
US4229912A (en) * 1978-05-30 1980-10-28 Laughlin William F Take-apart convertible rotary tool
US4258509A (en) * 1978-05-30 1981-03-31 Standard Abrasives, Inc. Flap-type rotary abrasive device
US4448590A (en) * 1978-05-30 1984-05-15 Standard Abrasives, Inc. Flap-type rotary abrasive device
US6840848B1 (en) * 2002-12-04 2005-01-11 Ralph E. Dyar Bushings and abrasive wheel therewith
US20050026556A1 (en) * 2003-07-30 2005-02-03 Sun Abrasives Corporation Grinding wheel having a fixing unit
US7115028B1 (en) * 2005-04-25 2006-10-03 Sunmatch Industrial Co., Ltd. Coupling structure for grinding members
US20070232212A1 (en) * 2004-10-19 2007-10-04 Gerhard Gissing Cut-Off Wheel Comprising a Double Core Clamping Device
US20120064809A1 (en) * 2009-05-13 2012-03-15 3M Innovative Properties Company Tufted buffing pad

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3741983A1 (de) * 1987-12-11 1989-06-22 Monti Werkzeuge Gmbh Rotativ antreibbare werkzeugspannvorrichtung

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US449239A (en) * 1891-03-31 Abold a
US2164800A (en) * 1938-05-12 1939-07-04 John F A Davis Abrasive article
US2444093A (en) * 1947-03-12 1948-06-29 Everil C Crumbling Egg cleaning device
US2521911A (en) * 1946-03-08 1950-09-12 Devoe & Raynolds Co Phenol-aldehyde and epoxide resin compositions
US2524626A (en) * 1948-09-22 1950-10-03 Clair E Harman Rotary egg cleaner
US2642705A (en) * 1951-04-19 1953-06-23 James L Jensen Polishing and sanding device
US2651894A (en) * 1952-03-13 1953-09-15 Merit Products Inc Flexible abrasive wheel
US2678523A (en) * 1953-09-08 1954-05-18 Merit Products Inc Abrasive wheel assembly

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US449239A (en) * 1891-03-31 Abold a
US2164800A (en) * 1938-05-12 1939-07-04 John F A Davis Abrasive article
US2521911A (en) * 1946-03-08 1950-09-12 Devoe & Raynolds Co Phenol-aldehyde and epoxide resin compositions
US2444093A (en) * 1947-03-12 1948-06-29 Everil C Crumbling Egg cleaning device
US2524626A (en) * 1948-09-22 1950-10-03 Clair E Harman Rotary egg cleaner
US2642705A (en) * 1951-04-19 1953-06-23 James L Jensen Polishing and sanding device
US2651894A (en) * 1952-03-13 1953-09-15 Merit Products Inc Flexible abrasive wheel
US2678523A (en) * 1953-09-08 1954-05-18 Merit Products Inc Abrasive wheel assembly

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078624A (en) * 1958-07-25 1963-02-26 Osborn Mfg Co Rotary abrading tool
US3206894A (en) * 1959-04-29 1965-09-21 Schaffner Mfg Company Inc Polishing wheel
US3206786A (en) * 1959-07-16 1965-09-21 Schaffner Mfg Company Inc Buffing wheel
US3028709A (en) * 1959-12-14 1962-04-10 David S Hedden Flexible abrasive wheel manufacture
US3004373A (en) * 1960-03-14 1961-10-17 Norton Co Abrasive devices
US3099113A (en) * 1961-01-18 1963-07-30 Formax Mfg Corp Work wheel
US3134202A (en) * 1962-01-11 1964-05-26 Harry H Hoefler Abrading apparatus for rotary cleaning operations
US3212219A (en) * 1962-01-17 1965-10-19 Merit Products Inc Method of fabricating abrasive leaves
US3191350A (en) * 1963-01-08 1965-06-29 Schaffner Mfg Company Inc Polishing apparatus
US3406488A (en) * 1965-09-23 1968-10-22 Minnesota Mining & Mfg Abrasive flap wheel
US3462888A (en) * 1967-01-24 1969-08-26 Schaffner Mfg Co Inc Polishing wheel and method for producing such wheel
US4229912A (en) * 1978-05-30 1980-10-28 Laughlin William F Take-apart convertible rotary tool
US4258509A (en) * 1978-05-30 1981-03-31 Standard Abrasives, Inc. Flap-type rotary abrasive device
US4448590A (en) * 1978-05-30 1984-05-15 Standard Abrasives, Inc. Flap-type rotary abrasive device
US6840848B1 (en) * 2002-12-04 2005-01-11 Ralph E. Dyar Bushings and abrasive wheel therewith
US20050026556A1 (en) * 2003-07-30 2005-02-03 Sun Abrasives Corporation Grinding wheel having a fixing unit
US20070232212A1 (en) * 2004-10-19 2007-10-04 Gerhard Gissing Cut-Off Wheel Comprising a Double Core Clamping Device
US8113920B2 (en) * 2004-10-19 2012-02-14 Gerhard Gissing Cut-off wheel comprising a double core clamping device
US7115028B1 (en) * 2005-04-25 2006-10-03 Sunmatch Industrial Co., Ltd. Coupling structure for grinding members
US20060240752A1 (en) * 2005-04-25 2006-10-26 Sunmatch Industrial Co., Ltd. Coupling structure for grinding members
US20120064809A1 (en) * 2009-05-13 2012-03-15 3M Innovative Properties Company Tufted buffing pad
US9415483B2 (en) * 2009-05-13 2016-08-16 3M Innovative Properties Company Tufted buffing pad

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