Patent Publication Number: US-11383353-B2

Title: Rotary brush with vibration isolation

Description:
CROSS REFERENCE 
     This application claims priority under 35 U.S.C. § 119(e) in U.S. Provisional Patent Application No. 62/584,186 filed Nov. 10, 2017, the entire disclosure of which is hereby expressly incorporated herein by reference. 
    
    
     FIELD 
     The present invention is directed to a rotary abrasive implement used in material removal, surface finishing, and other abrasive applications, and is more specifically directed to a rotary abrasive brush, such as a rotary cup brush, which is configured to isolate vibration generated during abrasive material removal from an operator grasping a rotary power tool rotating the brush during abrasive surface finishing use and operation of the brush. 
     BACKGROUND 
     Rotary abrasive implements, such as in the form of grinding wheels, cutting discs, abrasive discs, rotary brushes, and the like, are used in a wide variety of material removal and surface finishing applications, including to grind, cut, deburr, descale, sand, texturize, buff and polish objects, components, surfaces and the like. Such rotary abrasive implements typically are configured for removable attachment to a rotary drive, which typically is in the form of an air or electric powered rotary tool, such as a grinder, e.g., angle grinder, straight grinder, die grinder or bench grinder, a disc cutter, a drill, or another type of rotary power tool. 
     In use, the rotary abrasive implement is removably attached to a rotary drive, such as a rotary power tool, during which the abrasive implement is rotated at relatively high speeds ranging anywhere from several hundred revolutions per minute (RPMs) to several thousand RPMs. In operation, the rotary power tool rotates the abrasive implement which engages a workpiece to abrasively treat the workpiece to grind it, cut it, deburr it, descale it, sand it, polish it, or even buff it. During abrasive treatment of the workpiece, a human operator either manually holds and manipulates the rotary power tool to engage the rotating abrasive implement with the workpiece or manually holds and manipulates the workpiece into engagement with the rotating abrasive implement. 
     During use and operation, a considerable amount of vibration can occur, which not only can lead to operator fatigue and repetitive stress injuries, but such vibration can also make it more difficult to keep the rotating abrasive implement and workpiece in uniform contact with one each other. Where vibration is so great that it interferes with that ability to maintain uniform contact between the rotating abrasive implement and the workpiece, it can result in uneven abrasive material removal. Even worse, where such vibration cannot be adequately controlled or compensated for, it can lead to chatter, which can undesirably not only damage the surface of the workpiece being abrasively treated with the rotating abrasive implement, but it also can lead to excessive premature wear of the abrasive implement or even damage the rotary power tool. 
     One type of rotary abrasive implement is a rotary brush, such as a radial brush, wheel brush, cup brush or end brush, which are removably attached to a handheld rotary power tool, such as a hand held grinder or rotary drill, equipped with a handle, hand grip or the like, which is manually grasped by one or more hands of the operator to operate the tool and manipulate the rotating brush into engagement with the workpiece. The brush is formed of a center disc or hub from which elongate wire tufts outwardly extend, which each have a working face formed by the free ends of the wires or bristles of the tuft which engages the workpiece and abrasively removes material from the workpiece during rotation of the brush. As the bristles or wires of the tufts of the rotating brush contact the workpiece, the tips of the bristles or wires of the tufts of the rapidly rotating brush contact the workpiece in a manner that can cut, grind, deburr, descale, sand, texturize, buff or polish the workpiece. 
     During use and operation, friction and impacts between the tips of the bristles or wires of the tufts of the rapidly rotating brush and the workpiece cause vibration to arise, which typically is transmitted through the brush, to the rotary power tool rotating the brush, to the handle or hand grip of the power tool, and to the hands of the operator grasping the handle or hand grip of the tool. The frequency, magnitude, and duration of the vibration can vary but can be dependent on factors such as the force with which the operator is pressing the brush into engagement with the workpiece, the roughness, contour and other characteristics of the outer surface of the workpiece engaged by the rotating brush, as well as other factors. Such vibration can not only lead to operator fatigue and repetitive stress injury, it can also undesirably accelerate brush and rotary tool wear. In addition, such vibration can not only make it more difficult to uniformly abrasively treat the workpiece with the rotating brush, but excessive vibration can lead to damaging of the surface of the workpiece, such as when chatter occurs. 
     What is needed is an improved rotary abrasive implement configured to reduce vibration. What is needed is an improved rotary brush configured to reduce the magnitude of vibration generated during engagement with the workpiece that is transmitted through the rotary tool to the hands of an operator grasping the handle or hand grip of the tool. 
     SUMMARY 
     The present invention is directed to a rotary abrasive implement that is configured to isolate vibration generated during abrasive material removal from being transmitted to a rotary drive that preferably is a hand-held power tool, such as a grinder or drill, so less vibration is transmitted to the hands an operator grasping a handle or hand grip of the tool. A preferred vibration isolating rotary abrasive implement of the present invention is a rotary wire brush, such as a rotary wire cup brush, having wires or bristles extending outwardly from a perforate central brush wire carrying hub that is sandwiched between two plates carried by a rotary tool coupling configured to isolate brush vibration from the rotary power tool to which the brush is attached via the coupling. The wires or bristles of the brush can be arranged into groups of wires or bristles formed into tufts attached by twisting or twist knots to the hub forming a twisted knot brush with standard twist knots, cable knots or even stringer bead knots. Such a rotary vibration isolating abrasive implement of the present invention that is a rotary vibration isolating brush advantageously experiences reduced vibration, is easier to control or manipulate during abrasive material removal, prevents chatter during abrasive surface finishing, reduces noise during abrasive material removal, increases rotary brush and rotary tool life, and can help reduce operator fatigue and repetitive stress injuries. 
     The rotary tool coupling is part of a vibration isolating coupling assembly configured for attachment of components of the rotary brush, including one or both plates and/or the hub, configured for releasable or removable attachment of the brush to a rotary power tool, such as a hand-held rotary power tool, e.g., grinder or drill, and configured provide vibration isolation to isolate vibration generated by rotating brush engagement with a workpiece from the rotary power tool. A preferred rotary tool coupling includes an elongate shaft configured for releasable or removable mounting to a rotary power tool like a grinder or drill, and configured to generally coaxially receive or carry one or more and preferably all of the plates and hubs, and configured to rotate at least the hub and preferably the plates and the hub substantially in unison about a longitudinally extending center axis of the shaft when rotated by the rotary power tool during rotary brush use and operation. A preferred vibration isolating coupling assembly is configured for receipt of the hubs and each one of the plates during brush assembly, configured for releasable or removable mounting of the brush to a rotary power tool, and configured to isolate vibration generated by the rotating brush during abrasive material removal from the rotary power tool to which the brush is removably mounted. 
     The vibration isolating coupling assembly has a vibration isolator carried by an elongate brush component mounting shaft of the rotary tool coupling having (a) a pair of brush component retaining flanges between which the hub and plates are captured during assembly, and (b) a tool coupling end configured for removable attachment of the brush to a power tool. The vibration isolator isolates generated by wires or bristles in contact with a workpiece during brush rotation that reaches the hub or plates from being transmitted to the rotary tool coupling preferably by preventing vibration from being transmitted to the shaft of the coupling. A preferred vibration isolator preferably is composed of a material that also dampens vibration thereby further configuring it as a vibration dampener that dampens vibration that is transmitted to the coupling or shaft of the coupling thereby reducing the magnitude, amplitude or intensity of vibration that is transmitted to the shaft. Such a vibration isolating coupling assembly therefore advantageously prevents and preferably also reduces vibration reaching the coupling or shaft of the coupling thereby preventing and preferably also reducing vibration reaching an operator grasping a handle or handgrip of a rotary power tool attached by the coupling to the brush. 
     The vibration isolator isolates the plates, hub, and wires or bristles of the brush from the rotary tool coupling including by spacing the plates and hub from the rotary tool coupling. In a preferred vibration isolating coupling assembly, the vibration isolator spaces the plates and hub from rotary tool coupling preventing direct contact between (i) the plates and hub, and (ii) the coupling. In one such preferred vibration isolating coupling embodiment, the vibration isolator is configured to space the plates and hub from the shaft of the coupling in a manner that maintains space therebetween during abrasive material removal use and operation of the brush. By maintaining space between the (i) shaft of the coupling, and (ii) the plates and hub, direct contact is prevented between the (i) shaft of the coupling, and (ii) the plates and hub, thereby preventing direct transmission of vibration from one or more or all of the plates and hub to the coupling shaft. Preventing direct contact therebetween advantageously prevents and preferably also reduces vibration generated during rotary brush use and operation that is transmitted through the coupling shaft to the rotary tool rotatively driving the brush. 
     The vibration isolator is composed of a tough and resilient material that can be a compressible and non-metallic material that is configured to isolate vibration generated by contact with wires or bristles of the brush during abrasive material removal during brush rotation preventing at least some vibration from being transmitted to the rotary tool coupling. A preferred vibration isolator is composed of a tough and resilient material that preferably is nonmetallic and which can be compressible with the vibration isolator configured to isolate the shaft of the rotary tool coupling from the plates and hub helping prevent vibration generated during contact via wires or bristles of the brush engaging a workpiece being abrasively treated with the brush from being transmitted by the plates or hub to the shaft. The vibration isolator is made of an elastomer or elastomeric material. A preferred vibration isolator can be made of rubber, neoprene, silicone, viscoelastic urethane polymer, urethane, nylon, styrene, styrene elastomer, acrylic or another type of suitable elastomeric material. 
     One preferred vibration isolator is composed of a tough and resilient material that preferably is nonmetallic and which can also be compressible with the vibration isolator configured to not only isolate (i) the plates and hub from (ii) the coupling shaft but also is configured to dampen vibration actually transmitted to the shaft from hub or either plate advantageously reducing the amplitude, magnitude or intensity of vibration reaching one or both hands of an operator grasping a rotary power tool rotating the brush during abrasive material removal use and operation. Such a preferred vibration-dampening vibration isolator preferably is made of an elastomer or elastomeric material. A preferred vibration-damping isolator can be made of rubber, neoprene, silicone, viscoelastic urethane polymer, urethane, nylon, styrene, styrene elastomer, acrylic or another type of suitable elastomeric material. 
     A preferred embodiment a vibration coupling assembly includes at least one of a radial vibration isolator and an axial vibration isolator and preferably includes both a radial vibration isolator and axial isolator. While a vibration isolator composed of both a radial isolator and an axial isolator can be formed of a single vibration isolator of one-piece and unitary construction, the vibration isolator can be configured as a vibration isolator arrangement or vibration isolator assembly composed of a radial vibration isolator and an axial vibration isolator that are separate components. 
     Where the vibration isolating tool coupling assembly is equipped with a radial vibration isolator, the radial vibration isolator is configured to radially isolate (i) at least one of the plates and hub from (ii) the shaft of the coupling including by radially spacing (i) at least one of the plates and hub from (ii) the coupling shaft. A preferred radial vibration isolator is configured to isolate vibration transmission between opposed radial surfaces of at least one of the plates and hub from the coupling shaft, and preferably is configured to isolate vibration transmission between opposed radial surfaces of each one of the plates and hub from the coupling shaft. 
     Where equipped with a radial vibration isolator, the radial vibration isolator is disposed between (i) the shaft of the rotary tool coupling, and (ii) the hub and/or the plates and configured to provide radial vibration isolation therebetween helping prevent brush vibration from being transmitted via the wires, hub or plates in or along a radial direction to the coupling shaft thereby isolating such vibration from the rotary power tool to which the brush is mounted by the coupling. This advantageously prevents vibration generated by the rotating brush during abrasive material removal engagement with the workpiece from being transmitted to one or both hands of an operator using the rotary power tool rotating the brush. In a preferred embodiment equipped with a radial vibration isolator, the radial isolator is located between (i) the hub and the plates, and (ii) the coupling shaft providing radial vibration isolation therebetween that helps prevent transmission of brush vibration to the rotary power tool to which the brush is attached. 
     A preferred radial vibration isolator is a tubular radial vibration isolator that is received, e.g., telescoped, over at least part of the shaft of the coupling that carries the hub and plates and configured with the tubular vibration isolator serving as a vibration isolating spacer that spaces (i) the shaft from (ii) the hub and plates preventing direct contact therebetween. Where the plates and hub have non-circular shaft receiving openings of a complementary shape or configuration to a corresponding non-circular outer peripheral contour or cross-section of the coupling shaft keying the plates and hub for rotation in unison with the shaft, the tubular radiation vibration isolator is configured to conform to the non-circular outer peripheral contour or cross-sectional shape of the coupling shaft. Where a preferred embodiment of a vibration isolating rotary power tool coupling assembly has a coupling shaft of hexagonal cross-section, and the plates and hubs have complementarily hexagonally shaped shaft-receiving openings, the radial vibration isolator either is formed to have a hexagonal shape or cross section or is configured to be resiliently deformable, e.g., stretchable, to conform to the hexagonal cross section of shape of the coupling shaft when telescoped over the shaft. 
     Where the vibration isolating tool coupling assembly is equipped with an axial vibration isolator, the axial vibration isolator is configured to axially isolate (i) at least one of the plates and hub from (ii) the shaft of the coupling including by axially spacing (i) at least one of the plates and hub from (ii) the coupling shaft. A preferred vibration isolating tool coupling assembly is equipped with a plurality of axial vibration isolators with each axial vibration isolator is configured to isolate vibration transmission between opposed axial surfaces of at least one of the plates and the hub from the coupling shaft, and preferably configured to isolate vibration transmission between opposed axial surfaces of each one of the plates and hub from the coupling shaft. One such preferred vibration isolating coupling assembly has axial isolators located between an axial surface of the coupling shaft and an axial surface of a respective one of the plates. If desired, an axial isolator can also be disposed between an axial surface of one or both of the plates and an adjacent axial surface of the hub. 
     Where equipped with an axial vibration isolator, the vibration isolating coupling assembly includes at least one axial vibration isolator disposed between (i) one of the brush component retainer flanges of the coupling shaft, and (ii) one of the plates and the hub. Where equipped with an axial vibration isolator, the vibration isolating coupling assembly includes at least one axial vibration isolator located between (i) an axial surface of one of the brush component retainer flanges of the coupling shaft, and (ii) an opposed axial surface of one of the plates and the hub. 
     One preferred vibration isolating coupling assembly has at least one axial vibration isolator located between (i) one of the flanges of the coupling shaft, and (ii) an adjacent one of the plates with the at least one axial vibration isolator located between (i) an axial surface of one of the coupling shaft flanges, and (ii) a corresponding opposed axial flange of an adjacent respective one of the plates. Another such preferred vibration isolation coupling assembly is configured with a plurality of axial vibration isolators (i) having one of the axial isolators positioned between one of the flanges of the coupling shaft and one of the plates, and (ii) having another one of the axial isolators positioned between the other one of the flanges of the coupling shaft and the other one of the plates. The vibration isolation coupling assembly can be further configured to also have an axial vibration isolator between each one of the plates and the hub. In one preferred vibration isolation coupling assembly, there is an axial vibration isolator between each flange of the coupling shaft and one of the plates adjacent the flange and there also is an axial vibration isolator between each plate and the hub. 
     A vibration isolating rotary brush of the present invention has a vibration isolating coupling assembly having a radial vibration isolator carried by the coupling shaft that is disposed between both flanges and which can extend to one or both flanges, and at least one axial vibration isolator disposed between one of the flanges and one of the plates. A preferred vibration isolating brush of the present invention has a vibration isolating coupling assembly with a radial vibration isolator telescopically carried by the coupling shaft extending between the flanges of the shaft, and a plurality of axial vibration isolators with one axial vibration isolator between one of the coupling shaft flanges and one of the plates and another axial vibration isolator between the other one of the coupling shaft flanges and the other one of the plates. The one axial vibration isolator is disposed in abutment with the one of the coupling shaft flanges and in abutment with the one of the plates. The other one of the axial vibration isolators is disposed in abutment with the other one of the coupling shaft flanges and in abutment with the other one of the plates. 
     In a preferred vibration isolating brush of the present invention, the brush is a rotary wire cup brush with the pair of the plates being generally concave and three-dimensionally contoured to form coaxially nested generally frustoconical cups defining a brush wire, tuft or bristle guide channel along which the wires, bristles or tufts anchored to the hub radially and axially outwardly extends. Such a rotary wire cup brush can have bristles formed of wires of generally straight or crimped construction or bristles formed of wires braided and/or twisted including twisted knotted into brush wire tufts anchored by the knots to the hub. Vibration isolation of the cup brush provided by radial and/or axial vibration isolators of the vibration isolating rotary tool coupling assembly advantageously helps isolate and block transmission of vibration generated during abrasive material removing contact between the rotating brush and workpiece from being transmitted to an operator manually holding the rotary power tool to which the brush is removably coupled. The radial and/or axial vibration isolators preferably are also configured respectively as radial and/or axial vibration dampeners that absorb and thereby reduce the magnitude, amplitude or intensity of vibration actually transmitted from the brush to the tool reducing vibration encountered by the operator during brush use and operation. Such a rotary vibration isolating cup brush advantageously possesses longer life, experiences reduced vibration and chatter during use, reduces vibration encountered by an operator using a rotary tool to which the brush attached, reduces brush wear, reduces tool wear, increases brush life, increases tool life, reduces vibration-induced operator fatigue, and helps prevent repetitive stress injuries. 
     These and other objects, features and advantages of this invention will become apparent from the following more detailed description of the invention and accompanying drawings. 
    
    
     
       DRAWING DESCRIPTION 
       One or more preferred exemplary embodiments of the invention are illustrated in the accompanying drawings in which like reference numerals represent like parts throughout and in which: 
         FIG. 1  is a bottom rear perspective view of a rotary wire brush of the present invention that is a rotary wire cup brush of vibration isolating construction having an annular brush fill composed of wires; 
         FIG. 2  is a top front perspective view of the vibration-isolating rotary cup brush of  FIG. 1 ; 
         FIG. 3  is a right front perspective view of another preferred embodiment of a vibration-isolating rotary cup brush of the present invention having a brush fill composed of twisted wire tufts. 
         FIG. 4  is a partially cutaway exploded view of the vibration-isolating rotary cup brush of the present invention illustrating in more detail the location and arrangement of vibration isolation within the brush. 
     
    
    
     Before explaining one or more embodiments of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in any appended drawings. The invention is capable of other embodiments, which can be practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting. 
     DETAILED DESCRIPTION 
     With reference to  FIGS. 1-4 , the present invention is directed to a rotary abrasive implement  16  that is a rotary wire brush  18  that more preferably is a rotary wire cup brush  20  of vibration-isolating construction used for abrasively removing material from a workpiece (not shown) in performing surface finishing treatment of the workpiece. Such a rotary abrasive implement  16  that is a rotary brush  18  that more preferably is a rotary cup brush  20  of vibration-isolating construction is removably mounted to a rotary abrasive implement drive (not shown), such as a hand-held rotary drive, like a hand-held rotary power tool (also not shown), e.g., a grinder, such as an angle grinder, straight grinder, die grinder, or another hand-held grinder, a drill, or another type of hand-held power tool but can also be used with fixed rotary abrasive implement drives, such as a bench grinder or drill press. Such rotary drives can be electrically powered, pneumatically powered, or even powered in another manner, such as powered via an internal combustion engine. Such a vibration-isolating rotary abrasive implement  16  that is a vibration-isolating rotary brush  18  that more preferably is a vibration-isolating rotary cup brush  20  of the present invention is well suited for a wide variety of abrasive material removal and surface finishing applications, such as, paint removal, rust removal, descaling, deburring, blending, sanding, weld surface preparation, cleaning of finished welds, e.g., slag removal, polishing, buffing, and other types of abrasive material removal, abrasive surface treatment, and abrasive surface finishing applications. 
     A vibration isolating rotary abrasive implement  16 , vibration isolating rotary brush  18 , preferably vibration isolating rotary cup brush  20 , of the present invention is configured to provide vibration isolation between the workpiece and the rotary drive to which the abrasive implement  16 , brush  18 , and cup brush  20  is attached. Where the rotary drive is hand held, the rotary abrasive implement  16 , rotary brush  18 , preferably cup brush  20 , of the present invention is configured to provide vibration isolation between the workpiece and the rotary drive thereby preventing at least some vibration generated at the workpiece from being transmitted to the handle or hand-grip of the drive. As a result of the vibration isolating construction causing an operator to experience less vibration at the handle or hand-grip of the drive, more continuous contact between the abrasive implement  16 , brush  18 , preferably cup brush  20 , is maintained advantageously more uniformly finishing the surface of the workpiece. In addition, operator fatigue is reduced, noise can be reduced, and both the useful life of the abrasive implement  16 , brush  18 , preferably cup brush  20  and the drive are increased. Such an abrasive implement  16 , brush  18 , preferably cup brush  20  of the present invention preferably also is of vibration-damping construction in that the implement  16 , brush  18 , preferably cup brush  20 , reduces the magnitude of vibration generated at the workpiece transmitted through the implement  16 , brush  18 , preferably cup brush  20 , to the hand-held rotary drive and to the operator. 
     Where the rotary drive is a fixed rotary drive, the abrasive implement  16 , brush  18 , preferably cup brush  20 , of the present invention also is configured to provide vibration isolation between the workpiece and the fixed rotary drive thereby preventing at least some vibration generated at the workpiece to be transmitted to the fixed rotary drive. Reduced vibration not only can increase the useful life of the drive and the abrasive implement  16 , brush  18 , preferably cup brush  20 , but it can make any workpiece that is manipulated by hand into engagement with the abrasive implement  16 , brush  18 , preferably cup brush  20 , easier to manually urge into contact therewith helping producing a more uniform surface finish. Such an abrasive implement  16 , brush  18 , preferably cup brush  20  of the present invention preferably also is of vibration-damping construction in that the abrasive implement  16 , brush  18 , preferably cup brush  20 , reduces the magnitude of vibration generated at the workpiece that are transmitted through the abrasive implement  16 , brush  18 , preferably cup brush  20 , to the fixed rotary drive. 
     With continued reference to  FIGS. 1-4 , a preferred vibrationally-isolating rotary abrasive implement  16  is a vibrationally-isolating rotary wire brush  18  that is a vibrationally-isolating rotary wire cup brush  20  which preferably is a vibrationally-isolating and vibrationally-damping rotary wire cup brush  22 . In a preferred embodiment, the vibration-isolating rotary abrasive implement  16  is a vibration-isolating rotary wire brush  18  that is a vibration-isolating rotary wire cup brush  20  which preferably is a vibration-isolating, vibration-damping, and vibration-absorbing rotary wire cup brush  24  of the present invention configured to provide vibration isolation between the workpiece and the rotary drive, e.g., rotary power tool while also reducing the magnitude of vibration. In another preferred embodiment, the vibration-isolating rotary abrasive implement  16  is a vibration-isolating rotary brush  18  that is a vibration-isolating cup brush  20  which preferably is a vibration-isolating, vibration-damping, vibration-absorbing and shock absorbing rotary wire cup brush  26  of the present invention configured not only to provide vibration isolation between the workpiece and the rotary drive, e.g., rotary power tool but also configured to reduce the magnitude of vibration encountered as well as configured to absorb shock loads encountered during abrasive material removal. 
     Such a vibration-isolating rotary abrasive implement  16  of the present invention that preferably is a cup brush  20  configured to provide vibration isolation advantageously not only isolates at least some of the rotary cup brush vibration from the hands of an operator holding a hand-held rotary power tool rotating the cup brush preventing at least some vibration from reaching the operator, but preferably also dampens at least some of the rotary cup brush vibration further while reducing the magnitude or amplitude of other vibration that actually does reach the operator. As a result, such a vibration isolating and preferably vibration dampening cup brush  20  of the present invention thereby advantageously reduces and preferably minimizes operator fatigue while also reducing and minimizing the number, amount, severity and magnitude of repetitive stress related problems and injuries known to operators of such hand-held rotary brushes. As discussed in more detail below, a cup brush  20  of vibration and/or shock-loading dampened and/or isolating construction of the present invention advantageously significantly reduces operator fatigue by reducing the magnitude of vibration and/or shock loads transmitted from the rotating cup brush  20  to an operator manually holding a hand-held rotary brush drive, e.g., hand-held rotary power tool, during abrasive material removal in finishing or treating a surface with the cup brush  20 . 
     With reference to  FIGS. 1-2 , a vibration-isolating rotary wire brush  18  of the present invention has at least one plate  23  and/or  25  disposed alongside and in operable cooperation with a brush wire anchoring perforate center hub  38  from which brush wires  41  arranged to form an annular brush fill  32  outwardly extends with at least one plate  23  and/or  25  configured to support or help support the fill  32  during brush use by at least one plate  23  and/or  25  supporting wires  41  of the fill  32  during brush use. A preferred vibration-isolating rotary brush  18  of the invention has a pair of plates  23 ,  25  disposed in operable cooperation with the hub  38  by being operatively connected to the hub  38  such that the plates  23 ,  25  and hub  38  rotate in unison during rotation of the brush  18  by a rotary power tool during abrasive material removal using the brush  18 . In a preferred rotary brush embodiment, the hub  38  is sandwiched between at least a portion of the pair of plates  23 ,  25 . Where the brush  18  is equipped with a pair of plates  23 ,  25 , the plates  23 ,  25  are arranged to be located on opposite sides of the fill  32  and configured by being positioned to provide support to the fill  32  preferably by supporting at least a portion of wires  41  of the fill  32  that form bristles  43  of the brush  18 . 
     Where the brush  18  is a rotary cup brush  20 , the cup brush  20  has at least one plate  23  and/or  25  that is at least one three-dimensionally contoured or three-dimensionally shaped plate  27  and/or  29  disposed in operable cooperation with the hub  38  and configured to rotate substantially in unison with the hub  38  during brush operation and which is further configured to support bristles  43  formed of the portion of the wires  41  of the fill  32  that extend outwardly away from the hub  38  toward a workpiece abrasively engaged by the brush during brush operation. Where the brush  18  is a rotary wire cup brush  20  equipped with a pair of plates, the cup brush  20  is configured with the plates  23 ,  25  having respective central sections  53 ,  55  sandwiching the hub  38 , such as in the manner best shown in  FIG. 4 . Where the brush  18  is a rotary wire cup brush  20  equipped with a pair of plates, the cup brush  20  is configured with the plates  23 ,  25  being inner and outer plates  23 ,  25 , with the inner plate  23  being disposed interiorly or inwardly of the wire  41  of the fill  32  and the outer plate  25  being disposed exteriorly or outwardly of the wire  41  of the fill  32 . In a preferred embodiment, the rotary wire brush  18  is a rotary wire cup brush  20  equipped with a pair of plates  23 ,  25  that are three dimensionally shaped that respectively have (a) centrally disposed sections  53 ,  55 , e.g., bottom walls  34 ,  36 , overlapping and sandwiching the hub  38  therebetween, and (b) generally annular sidewalls  44 ,  46  disposed respectively on opposite sides of the fill  32  of the brush preferably contacting and supporting bristles  43  or wires  41  of the fill  32  of the brush. 
     In a preferred embodiment, a vibration-isolating cup brush  20  of the invention has a pair of three-dimensionally contoured or shaped plates  27 ,  29  which preferably are generally convex or convexly-shaped respectively defining inner and outer brush wire supporting cups  28 ,  30  disposed on opposite sides of the fill  32 . Where the cup brush  20 ′ is made with wires  41  twisted into brush wire tufts  42  like the cup brush  20 ′ shown in  FIG. 3 , the inner and outer supporting cups  28 ,  30  are disposed on opposite sides of the twisted wire, e.g., twisted tuft or twisted knot, tufts  42  that form the fill  32 ′ of the brush  20 ′. Each brush wire supporting cup  28  and/or  30  provides support to the wires  41  and/or tufts  42  of the fill  32  or  32 ′ during abrasive engagement with a workpiece being abrasively treated by the brush  20  or  20 ′ helping maintain better more uniform abrasive brush bristle contact with the workpiece. Each brush wire supporting cup  28  and/or  30  provides support to the wires  41  and/or tufts  42  of the fill  32  or  32 ′ in a manner that also helps prevent bristles  43  or wires  41  of the brush  20  or  20 ′ from bending, crinkling, splaying or otherwise undesirably deflecting during abrasive engagement with the workpiece during brush cup use and operation. 
     As best shown in  FIGS. 1-2 , a preferred rotary cup brush  20  of the present invention has a smaller diameter inner brush wire, brush wire filament, or brush bristle supporting cup  28  generally coaxially nested within a larger diameter outer brush wire, brush wire filament, or brush bristle supporting cup  30  and has an abrasive bristled brush fill  32  formed of elongate brush wires  41  extending outwardly from a brush bristle guide channel  48  formed by and between the cups  28  and  30 . As is best shown in  FIG. 2 , the wires  41  of the abrasively-bristled brush fill  32  extend outwardly along the channel  48  beyond the channel  48  defined between the sidewalls  44  and  46  of the cups  28  and  30  with the exposed bristles  43  having tips  45  at their free end forming an abrasive workpiece engaging working face  35  that contacts the workpiece during abrasive material removal using the brush. Where the cup brush  20 ′ is formed of brush tufts  42 , like the cup brush  20 ′ of  FIG. 3 , the workpiece face  35 ′ is formed by the tips  45  of the bristles  43  composed of wires  41  twisted together to form the tufts  42  twist knot anchored to the hub  38 . The inner and our brush cups  28  and  30  are of substantially rigid, metallic or metal, e.g., steel, construction, and bracket the radially inner and outer boundaries of the wires of the abrasively-bristled annular brush fill  32  with the brush cup sidewalls  44 ,  46  providing support wires  42  and tufts  42  at least along one quarter the length and preferably along at least forty percent the length of the wires  41 , bristles  43 , or tufts  42  of the cup brush  20  or  20 ′ during cup brush operation. 
     With specific additional reference to  FIG. 3 , a rotary wire cup brush  20 ′ that is of twisted tuft or twisted knot construction can also be configured to be a vibrationally isolating and preferably also a vibrationally damping or vibration absorbing cup brush  20 ′ in accordance with the invention. Such a cup brush  20 ′ has all of the vibrationally isolating components shown in  FIGS. 1-2 and 4  and discussed elsewhere herein but can differ in other respects therefrom, including by being of twisted tuft or twisted knot construction. Such a twisted tuft or twisted knot rotary wire cup brush  20 ′ has elongate wires  41  arranged in elongate brush wire tufts  42  that extend radially outwardly of the hub  38  of the brush  20 ′. In a preferred embodiment, the tufts  42  are of twisted knot construction formed by groups of at least a plurality of pairs, i.e., at least three, elongate wires  41  looped through respective openings  40  in the hub  38  and twisted together to form knots that anchor the tufts  42  to the hub  38 . The tufts  42  can be anchored to the hub  38  with standard twist knots, cable knots, or even stringer bead knots and the wires  42  that form each tuft  42  twisted together at least one-half and preferably at least two-thirds the length of the wires  41  and tufts  42 . As with the wire fill cup brush  20  shown in  FIGS. 1 and 2 , the twisted knot cup brush  20 ′ of  FIG. 3  has inner and outer cups  28  and  30  of generally cylindrical or frustoconical construction having their respective brush cup sidewalls  44  and  46  concentrically bracketing or bounding opposite sides of the tufts  42  helping to support the tufts  42  when in abrasive material removing engagement with a workpiece. The sidewalls  44  and  46  of the cups  28  and  30  respectively provide radially inner support and radially outer support to the tufts  42  of the brush  20 ′ that form the generally cylindrical or annular fill  32 ′ of the brush  20 ′. The inner and outer cups  28  and  30  of the brush  20 ′ are of substantially rigid, metallic or metal, e.g., steel, construction, and bound or encompass, e.g., radially or concentrically encircle, the tufts  42  that make up the fill  32 ′ of the brush  20 ′ thereby providing support to the tufts  42  of the fill  32 ′ as well as to individual wires  41  that make up the tufts  42  along at least one-third the length of the wires  41  or tufts  42 , preferably along at least forty percent the length of the wires  41  or tufts  42 , and more preferably along at least one half the length of the wires  42  or tufts  42  during abrasive material removal using the brush  20 ′ 
     As shown in  FIG. 4 , the inner cup  28  of a vibration isolating rotary brush  20  or  20 ′ of the invention has a generally flat or planar and generally circular cup bottom wall  34  from which a generally cylindrical and preferably frustoconical cup sidewall  44  generally axially outwardly extends. The outer cup  30  of the brush  20  also has a generally flat or planar and generally circular cup bottom wall  36  from which a generally cylindrical and preferably frustoconical cup sidewall  46  generally axially outwardly extends. Each cup  28  and  30  is respectively made of a three-dimensionally formed plate  27  and  29 , such as a metal plate, e.g., steel plate, which preferably is generally concavely shaped or formed producing such a generally concave cup-shaped three-dimensionally formed plate  27  and  29  respectively having a bottom wall  34  and  36  from which corresponding extends a corresponding generally frustoconical cup sidewall  44  and  46 . The respective cup bottom walls  34  and  36  overlie one another sandwiching a perforate generally disc-shaped substantially rigid brush wire anchoring hub  36  therebetween. The brush wire anchor hub  38  has circumferentially spaced apart generally circular brush-wire receiving holes  40  about its periphery from which elongate brush wires  41  outwardly extend. Where twisted like the wires  41  of the twisted tuft or twisted knot cup brush  20 ′ shown in  FIG. 3 , the elongate brush wires  41  extend through a corresponding one of the holes  40  in the hub  38  and are twisted to form tufts  42  and twist knots that anchor the tufts  42  to the hub  38 . Where straight or crimped like the wires  41  that form the fill  32  of the cup brush  20  shown in  FIGS. 1 and 2 , the wires  41  can extend through the holes  40  in the hub  38  and be wrapped around part of the hub  38  to anchor the wires  41  thereto or can be fixed, attached or otherwise anchored to the hub  38  in a different manner. Although not clearly shown in  FIGS. 1 and 2 , the abrasively bristled brush fill  32  is formed of a plurality of pairs of the brush wire tufts  42  projecting axially from the brush bristle or filament guide channel  48  outwardly beyond outer peripheral edges  37 ,  39  of the cups  28 ,  30 . 
     With continued reference to  FIG. 4 , each one of the nested cups  28 ,  30  of a vibration isolating rotary brush  20  or  20 ′ of the present invention have a respective sidewall  44 ,  46  nested generally coaxial within one another defining the brush wire or filament channel  48  therebetween from which the wire tufts  42  of the bristled brush  32  extend. The cup sidewalls  44  and  46  support at least a portion of the elongate wires  41  or bristles  43  of the cup brush fill  32 , including where the fill  32 ′ is formed of tufts  42  of such wires  41  or bristles  43 . Such wires  41 , bristles  43  and/or tufts  42  of the fill  32  or  32 ′ of the brush  20  or  20 ′ extends generally in an axial direction and generally parallel with the inner cup sidewall  44  bounding and supporting the radially innermost portion of the wires  41 , bristles  43  or tufts  42 . Such wires  41 , bristles  43  and/or tufts  42  of the fill  32  or  32 ′ of the brush  20  or  20 ′ extends generally in an axial direction and generally parallel with the outer cup sidewall  46  bounding and supporting the radially outermost portion of the wires  41 , bristles  43  or tufts  42 . As also shown in  FIG. 4 , the bottom wall  36  of the outer cup  30  preferably is configured with a recessed annular well  50  for accommodating wires  41  or bristles  43  that make up the fill  32  of the brush  20  including where the wires  41  or bristles  43  are twisted into tufts  42  that that extend generally downwardly and outwardly from corresponding holes  40  in the hub  38 . 
     In such a finished or assembled vibration isolating and/or vibrationally-damped rotary brush  20  of the present invention, the brush wire hub  38  is sandwiched between the cup bottoms  34  and  36  and preferably operatively connected together by an elongate generally centrally disposed tubular rotary tool coupling  58 , which preferably is generally cylindrical, for rotation substantially in unison about a central rotational axis of the brush  20  or  20 ′ by a hand-held rotary drive during use and operation of the brush  20  or  20 ′. Each one of the cups  28 ,  30  and the brush wire anchor hub  38  is formed with a coupling mount, preferably in the form of generally coaxially aligned hexagonal openings  52 ,  54 , and  56  formed respectively in cups  28 ,  30  and hub  38 , which are each configured for axially receiving part of the tubular rotary tool coupling  58 , which preferably has a generally hexagonal exterior cross-sectional shape. The generally hexagonal exterior cross-sectional shape of the tubular rotary tool coupling  58  is substantially complementary in shape and size to or with the corresponding hexagonal openings  52 ,  54  and  56  respectively formed in the cups  28 ,  30  and hub  38  which are substantially aligned with one another when the tubular rotary tool coupling  58  is inserted into and through the openings  52 ,  54  and  56  during brush assembly. When the tubular rotary tool coupling  58  is inserted through the hexagonal openings  52 ,  54  and  56  in the cups  28 ,  30  and hub  38 , the cups  28 ,  54  and the hub  38  are keyed to the coupling  58  for rotational in unison with the coupling  58  when the coupling  58  attaches the brush  20  or  20 ′ to a rotary power tool like a hand-held grinder or hand-held drill. The rotary tool coupling  58  shown in  FIG. 4  is not only configured to enable releasable or removable mounting or attachment of the cup brush  20  or  20 ′ to such a rotary power tool, the brush cups  28 ,  30  and hub  38  are generally coaxially carried thereby with the coupling  58  being generally centrally disposed relative thereto with a central longitudinally extending axis extending along its lengthwise or longitudinal extent substantially coaxial defining an axis of rotation of the brush  20  or  20 ′ when the brush  20  or  20 ′ is mounted by the coupling  58  to a rotary power tool. 
     With continued reference to  FIG. 4 , a vibrationally isolating and/or vibrationally dampening rotary brush  20  or  20 ′ of the present invention has a vibration isolator  59  that vibrationally isolates the coupling  58  from at least one of the brush wire hub  38  and cups  28  and/or  30 , which isolates the coupling  58  from at least a plurality of the brush wire hub  38  and cups  28  and/or  30 , and preferably which isolates the coupling  58  from each one of the brush wire hub  38  and cups  28  and/or  30 . The vibration isolator  59  preferably also is a vibration dampener  61  configured such that (a) vibration of or from at least one of the brush wire hub  38 , including vibration of or from brush wire tufts  42  contacting or engaging the surface undergoing abrasive surface treatment, and/or cups  28  and/or  30  is dampened during or before being transmitted to coupling  58 , (b) vibration of or from at least a plurality of the hub  38 , including vibration of or from brush wire tufts  42  contacting or engaging the surface undergoing abrasive surface treatment, and/or cups  28  and/or  30  is dampened during or before being transmitted to coupling  58 , and (c) vibration of or from each one of the hub  38 , including vibration of or from brush wire tufts  42  contacting or engaging the surface undergoing abrasive surface treatment, and cups  28  and  30  is dampened during or before being transmitted to coupling  58  there preventing at least some vibration from being transmitted to one or both hands of the operator holding the rotary power tool that is rotating the cup brush  20 , and preferably also reducing the strength or intensity of vibration actually reaching one or both hands of the operator holding the rotary power tool that is rotating cup brush  20 . 
     In a preferred rotary cup brush embodiment, the vibration isolator  59  isolates and preferably also dampens at least the hub  38  from the coupling  58  thereby isolating vibration generated by or arising due to abrasive contact between the surface being abrasively treated with the rotating cup brush  20  or  20 ′ by or from tips  45  of wires  41  or bristles  43  of the fill  32  of the brush  20  or  20  coming into contact with the surface being abrasively treated thereby preventing at least some of the vibration from being transmitted to the hands of an operator grasping the rotary power tool rotating the brush  20  or  20 ′. In at least one such preferred rotary cup brush embodiment, the vibration isolator  59  also is configured to be a vibration dampener  61  that dampens, absorbs and/or reduces the amplitude, strength or intensity of such rotary brush vibrations generated by or arising from abrasive contact of the face  35  or  35 ′ of the rotating brush  20  or  20 ′ with the workpiece being abrasively treated thereby reducing the amplitude, strength or intensity of any vibrations not isolated by the vibration isolator  59  which are transmitted to an operator holding the rotary power tool to which the brush  20  or  20 ′ is attached. Where the vibration isolator  59  also is configured with vibration dampening characteristics so as to be a vibration dampener  61 , it preferably also is configured to alter and preferably reduce the frequency of vibrations generated by or arising from contact of the tips  45  of the wires  41  or bristles  42  of the abrasive face  35  or  35 ′ of the brush  20  or  20 ′ with the workpiece during rotation of the brush  20  or  20 ′ by the rotary power tool. A preferred vibration isolating cup brush  20  or  20 ′ of the present invention is equipped with a vibration isolator  59  that also provides vibration dampening such that it is thereby also configured as a vibration dampener  61  to both prevent vibrations generated at the brush  20  or  20 ′ during abrasive material removal from reaching an operator manually grasping the rotary power tool to which the brush  20  or  20 ′ is attached, and also dampen or absorb vibration thereby reducing the magnitude, amplitude or intensity of vibrations generated at the brush  20  or  20 ′ during abrasive material removal that reaches the operator manually holding on to the rotary power tool to which the brush  20  or  20 ′ is attached. 
     With continued reference to  FIG. 4 , the rotary tool coupling  58  of a preferred embodiment of a vibrationally isolated or vibrationally isolating rotary brush  20  or  20 ′ of the invention can be and preferably is of vibrationally isolating and/or vibrationally damped construction that vibrationally isolates and/or dampens rotary cup brush vibration during contact of the wires  41  or bristles  43  of the rotating brush  20  or  20 ′ with the surface being treated during abrasive material removal thereby reducing, minimizing and preferably preventing transmission of rotary brush vibration via the coupling  58  to one or both hands of an operator manually grasping the hand-held tool rotatively mounted to the brush  20  via such a vibrationally isolated and/or damped coupling  58 . While the present invention contemplates a vibrational isolating and/damped coupling  58 , where the vibration isolator  59  and/or dampener  61  is integrally formed with or constructed as an integral part of the coupling  58 , e.g., where the isolator  59  and/or dampener  61  and coupling  58  are formed as a one-piece unit, a preferred vibration isolating and/or damped rotary cup brush  20  or  20 ′ of the present invention is constructed with a vibration isolating coupling assembly  80  of the present invention that also is a vibration dampening coupling assembly  85 , which includes one or both of a vibration isolator  59  and a vibration dampener  61 , such as depicted in  FIG. 4  and disclosed in more detail below. 
     Such a vibration isolating and/or vibration damped rotary brush  20  of the present invention has such a vibration isolating coupling assembly  80  and preferably also is or includes such a vibration dampening coupling assembly  85  formed of coupling  58  disposed in operable cooperation with at least one vibration isolator  59  and/or at least one vibration dampener  61  disposed between the coupling  58  and the other components of the brush  20 , including hub  38 , and cups  28  and  30 . Each isolator  59  and/or each dampener  61  of a vibration isolating and/or vibration dampening rotary cup brush  20  or  20 ′ of the present invention is made of a vibration isolating material and/or damping material, e.g., vibration absorbing material, which preferably is an elastomer, an elastomeric material, or another type of suitable compressible and resilient material that can also be or include a viscoelastic material having suitable vibration isolating, vibration damping, and/or vibration absorbing characteristics. Examples of suitable vibration isolating and/or vibration damping materials include one or more of a rubber, e.g., natural and/or synthetic rubber, including silicone rubber, butyl rubber, neoprene rubber, or another type of suitable rubber. Other suitable vibration isolating and/or vibration dampening materials include nylon, polypropylene, a polyether based polyurethane, polytetrafluoroethylene (PTFE), polyvinylchloride, a fluoropolymer elastomer, viscoelastic polymers, and combinations and/or composites thereof that can be of multilayered and/or multicomponent construction. 
     The vibration isolator  59  of a vibration isolating rotary cup brush  20  or  20 ′ of the present invention can be and preferably is in the form of a vibration isolating assembly  60  formed of at least one radial vibration isolator  62  of tubular construction and which is disposed between radially opposing surfaces of (i) the rotary power tool coupling  58 , and (ii) the hub  38  and cups  28 ,  30  of the brush  20  or  20 ′ during assembly of the brush  20  or  20 ′. In a preferred embodiment, each vibration isolator  59  of a rotary cup brush  20  or  20 ′ of the invention preferably is in the form of a vibration isolating assembly  60  formed of (a) at least one radial vibration isolator  62  of tubular construction and which is disposed between radially opposing surfaces of (i) the rotary power tool coupling  58 , and (ii) the hub  38  and cups  28 ,  30  of the brush  20  or  20  when the brush  20  or  20 ′ is assembled with the coupling  58 , and (b) at least one axial vibration, preferably a plurality of spaced apart axial vibration isolators  64   a  and  64   b , disposed between axially opposing surfaces (i) of the coupling  58 , and (ii) of at least one and preferably at least a plurality of the cups  28 ,  30  and hub  38 , when the brush  20  is assembled using the coupling  58 . In a preferred embodiment, the radial vibration isolator  62  is configured to also provide vibration dampening or vibration absorption, and each axial vibration isolator  64   a ,  64   b  also is configured to provide vibration dampening or vibration absorption. As shown in  FIG. 4 , a preferred rotary cup brush  20  or  20 ′ constructed in accordance with the present invention has at least one radial vibration isolator  62  and at least one axial vibration isolator, preferably a plurality of spaced apart axial vibration isolators  64   a  and/or  64   b . As shown in  FIG. 4 , radial vibration isolator  62  is tubular and preferably elongate and generally cylindrical and each axial vibration isolator  64   a ,  64   b  is annular or generally disc-shaped. As depicted in  FIG. 4 , the axial vibration isolators  64   a  and  64   b  are carried by the elongate tubular rotary power tool coupling  58  and spaced apart from one another by or along the coupling  58 . The axial vibration isolators  64   a  and  64   b  are spaced apart along the coupling  58  and generally coaxial with the coupling  58 . The axial vibration isolators  64   a  and  64   b  preferably are also generally coaxial with each other. Radial vibration isolator  62  preferably is configured with vibration dampening or vibration absorbing characteristics thereby imparting vibration dampening or vibration absorbing to the isolator  62 . Each axial vibration isolator  64   a ,  64   b  preferably also is configured with vibration dampening or vibration absorbing characteristics thereby imparting vibration dampening or vibration absorbing to each axial isolator  64   a ,  64   b.    
     In a presently preferred embodiment of a vibration isolating rotary brush of the present invention, a vibrational isolating and/or vibrational dampening rotary cup brush  20  or  20 ′ of the present invention is constructed with (a) at least at least one radial vibration isolator and/or radial vibration dampener  62  advantageously providing radial vibration isolation and/or radial vibration damping at or along at least one radial location within the assembled brush  20  or  20 ′, and (b) a pair of axial vibration isolators and/or axial vibration dampeners  64   a  and  64   b  with the pair of axial vibration isolators and/or axial vibration dampeners  64   a  and  64   b  being axially spaced apart from one another within the assembled brush  20  or  20 ′ thereby advantageously providing axial vibration isolation and/or axial vibration dampening at a pair of axially spaced apart locations within the assembled brush  20  or  20 ′. The at least one radial vibration isolator and/or radial vibration dampener  62  and each one of the axial vibration isolators and/or axial vibration dampeners  64   a  and  64   b  advantageously not only isolates vibration but also isolates shocks, jolts, impacts and the like generated, encountered or arising at the abrasive brush face  35  or  35 ′ during abrasive surface finishing with the rotating brush  20  or  20 ′ but also advantageously absorbs such vibrations, shocks, jolts, impacts, and the like generated, encountered or arising at the abrasive brush face  35  or  25 ′ during abrasive surface finishing by reducing the intensity, magnitude, amplitude or intensity of such vibrations, shocks, jolts, impacts, and the like generated, encountered or arising at the abrasive brush face  35  or  25 ′ during abrasive surface finishing. Such a rotary cup brush  20  or  20 ′ of the present invention preferably has at least one radial vibration isolator that isolates at least some vibration, shocks, jolts, impacts and the like produced by abrasive workpiece engagement of the abrasive face  35  or  35 ′ of the wire, bristled or tufted fill  32  or  32 ′ of the rotating brush  20  or  20 ′ during abrasive surface treatment from being transmitted to hands of an operator using a hand-held rotary power too to which the brush  20  or  20 ′ is attached. Where a rotary cup brush  20  or  20 ′ constructed in accordance with the present invention is equipped with at least one such radial vibration isolator, the radial vibration isolator  62  preferably is in the form of a vibration and/or shock isolating tube  66  that can be and which preferably also is a vibration and/or shock dampening or absorbing tube  66  having the construction, arrangement and configuration in accordance with that shown in  FIG. 4  and described in more detail elsewhere herein. 
     Where constructed with a tubular radial vibration isolator  62  in the form of a radial vibration isolating tube  66  that can be a generally cylindrical vibration isolating tube  66 , the vibration isolating tube  66  is disposed between (i) the rotary power tool coupling  58 , and (ii) the cups  28 ,  30  and the hub  38 , with the vibration isolating tube  66  having a cross-section substantially complementary to or with the coupling receiving or coupling mounting openings  52 ,  54  and  56  formed respectively in the cups  28 ,  30  and hub  38 . In a preferred embodiment, the vibration isolating tube  66  has a generally hexagonal cross section so as to be telescoped or received over the generally hexagonal exterior of the coupling  58  locating the vibration isolating tube  66  between (i) the coupling  58  and (ii) the cups  28 ,  30  and hub  38  configuring the vibration isolation tube  66  to provide vibration isolation between the (i) the coupling  58 , and (ii) the cups  28 ,  30 , and the hub  38  during rotary brush operation. In other words, the vibration isolating tube  66  is configured to isolate vibrations arising in or encountered by the hub  38  and/or cups  28 ,  30  from the coupling  58  during rotary brush operation thereby preventing at least some vibration arising or encountered by the hub  38  and/or cups  28 ,  30  from being transmitted to the coupling  58 . A preferred embodiment of the vibration isolation tube  66  is configured to dampen or absorb vibration thereby reducing the magnitude or intensity of any vibration that actually is transmitted from the hub  38  and/or cups  28 ,  30  to the coupling  58  and the hand-held rotary power tool connected by the coupling  58  to the brush  20  or  20 ′. 
     In one such preferred embodiment, the vibration isolation tube  66  has a generally hexagonal cross section so as to be received in and/or extend through the hexagonal openings  52 ,  54  and  56  respectively formed in the cups  28 ,  30  and the hub  38  configuring the vibration isolation tube  66  to be located between (i) the coupling  58 , and (ii) the cups  28 ,  30 , and the hub  38  such that the vibration isolation tube  66  provides vibration isolation between the i) the coupling  58 , and (ii) the cups  28 ,  30 , and the hub  38  during rotary brush operation. In other words, the vibration isolation tube  66  is configured to isolative vibrations arising in or encountered by the hub  38  and/or cups  28 ,  30  from the coupling  58  during rotary brush operation. A preferred embodiment of the vibration isolation tube  66  is configured to dampen or absorb vibration thereby reducing the magnitude or intensity of any vibration that actually is transmitted from the hub  38  and/or cups  28 ,  30  across or through the tube  66  to the coupling  58  and the hand-held rotary power tool connect to the brush  20  or  20 ′ by the coupling  58 . 
     As also shown in  FIG. 4 , the vibration isolating tube  66  is elongate with the tube  66  disposed between (i) inner peripheral edges of corresponding portions of the respective cups  28 ,  30  and hub  38  that define the respective coupling-receiving openings  52 ,  54  and  56  formed therein, and (ii) a rotary tool coupling shaft  68  of the rotary power tool coupling  58  to which the cups  28 ,  30  and the hub  38  are attached during brush assembly. The coupling shaft  68  preferably is elongate, can be generally cylindrical, but which preferably has a non-circular cross-section or cross-sectional shape which is substantially complementary to or with substantially complementary non-circular openings formed respectively in the cups  28 ,  30  and hub  38 . When the cups  28 ,  30  and hub  38  are assembled with the non-circular shaft  68  received through the non-circular openings in the cups  28 ,  30  and hub  38 , rotation of the shaft  68  by the rotary power tool to which the shaft  68  is coupled causes the cups  28 ,  30  and hub  38  to rotate in unison with the rotating shaft  68 . The vibration isolating tube  66  can also be formed to have a non-circular cross-section substantially complementary with the non-circular cross-section of the shaft  68  so that the tube  66  can be telescoped over part of the shaft  68 . If desired, the vibration isolating tube  66  generally cylindrical and flexible so as to conform to the non-circular cross-sectional exterior shape of the shaft  68  when the tube  66  is telescoped over the shaft  68 . A preferred shaft  68  has a generally hexagonal cross-section or hexagonal exterior cross-sectional shape, the openings in the cups  28 ,  30  and hub  38  are hexagonal, and the tube  66  can be and preferably also is of a hexagonal shape, all for the cups  28 ,  30 , hub  38  and tube  66  to be telescopically received by the shaft  68  with the tube  66 . When the cups  28 ,  30 , hub  38  and tube  66  are telescoped over or telescopically receive the shaft  68 , the tube  66  preferably is disposed between (i) the shaft  68 , and (ii) the cups  28 ,  30  and hub  38  providing vibration isolation therebetween. 
     When the vibration isolating rotary cup brush  20  or  20 ′ is assembled, the vibration isolating tube  66  radially isolates the coupling  58  from at least one of, preferably at least a plurality of, and more preferably all of the cups  28 ,  30  and hub  38  by the tube  66  being made of a resilient vibration isolating material and disposed between the coupling  58  and at least one of, preferably at least a plurality of, and more preferably all of the cups  28 ,  30  and hub  38  thereby preventing the coupling  58  from coming into contact in or along a radial direction with at least one of, preferably at least a plurality of, and more preferably all of the cups  28 ,  30  and hub  38 . In a preferred embodiment, the vibration isolating tube  66  is made of a tough and resilient vibration isolating material, preferably a suitable elastomer or elastomeric material, and located between (i) the coupling  58 , and (ii) the cups  28 ,  30  and hub  38 , providing vibration isolation between the (i) the coupling  58 , and (ii) the cups  28 ,  30  and hub  38  by the tube  66  preventing the (i) the coupling  58 , from coming into contact with any one of the (ii) the cups  28 ,  30  and hub  38  during rotary brush operation. 
     In a preferred embodiment of the vibration isolating rotary brush  20  or  20 ′ of the invention, the vibration isolating tube  66  radially vibrationally isolates the shaft  68  of the coupling  58  from the cups  28 ,  30  and hub  38  by being substantially coaxially carried by the shaft  68  and preferably telescoped over at least part of the shaft  68  thereby locating the tube  66  radially between the shaft  68  and each one of the cups  28 ,  30  and the hub  38  thereby preventing direct contact therebetween during use of the rotary cup brush  20  or  20 ′ during abrasive material removal of or from a workpiece surface during surface treatment, e.g., surface finishing, of the workpiece. By being disposed therebetween and preventing direct contact therebetween, the tube  66  is a radial vibration isolator, e.g., radial vibration isolating tube  66 , by isolating at least some vibration arising in the hub  38  generated by the wires  41  of the fill  32  of the rotating brush  20  or  20 ′ abrasively removing material of or from the workpiece surface being treated by the rotating brush  20  or  20 ′. By providing such vibration isolation, at least some of the vibration generated by or produced from the wires  41  of the abrasive face  35  or  35 ′ of the fill  32  or  32 ′ of the brush abrasively contacting the surface being finished is prevented from being transmitted to the shaft  68  of the coupling  58  used to mount the brush  20  to a hand-held rotary power tool manually held and operated by a human operator. Preventing via such isolation by tube  66  of at least some of vibration generated during surface finishing with rotating brush  20  or  20 ′ from being transmitted to one or both hands of the operator grasping the rotary brush drive rotating the brush  20  or  20 ′ advantageously reduces and preferably minimizes operator fatigue, reduces and preferably prevents hand and forearm strain, and/or helps reduce, minimize and preferably substantially completely prevent one or more other repetitive stress related injuries often experienced by rotary brush operators. In addition, such a radial vibration isolating tube  66  also prevents transmission to one or both hands of the operator of at least some of the shocks, jolts, impacts, and the like generated, produced or otherwise encountered during or by contact of brush wires of the bristled brush  32  of the rotating brush  20  with the surface being abrasively treated or finished therewith further reducing and preferably minimizing operator fatigue, reducing and preferably also helping prevent hand and forearm strains, and/or helping reduce, minimize and preferably substantially completely prevent one or more other repetitive stress related injuries often experienced by such rotary cup brush operators. 
     In a preferred vibration isolating rotary brush of the present invention, the vibration isolating tube  66  also is configured to provide vibration dampening such that the vibration isolating tube  66  also is configured as a radial vibration dampener thereby providing a radial vibration dampening tube  67  that is disposed radially between the coupling  58 , preferably between its shaft  68 , and at least one, preferably at least a plurality, and more preferably each one of the respective inner edges of cups  28 ,  30  and hub  38  that defining corresponding openings  52 ,  54  and  56  respectively formed therein thereby not only providing vibration isolation, such as in accordance with that discussed in the preceding paragraph above, but vibration dampening and vibration absorption that reduces the magnitude or amplitude of at least some of the vibration, shocks, jolts, impacts, and the like caused by contact of the bristled brush  32  with the surface being abrasively treated or finished being transmitted to one or both hands of a person operating the hand-held rotary power tool to which the rotary brush  20  or  20 ′ is coupled. Such a vibration dampening tube  66  not only provides such vibration and shock or impact load or force isolation, but preferably thereby also is of a dampening construction by being configured to provide vibration dampening tube  67  that reduces the magnitude of vibration, shocks, jolts, impacts and the like produced by contact of the brush wires  41  or bristles  43  of the abrasive face  35  or  35 ′ of the brush fill  32  or  32 ′ of the brush  20  or  20  with the surface being treated or finished that are actually transmitted radially from the wires  41  or bristles  43  and  38  to the shaft  68  of the rotary power tool coupling  58  to one or both hands of an operator holding the hand-held rotary power tool rotating the brush  20  or  20 ′ during abrasive surface finishing or treatment. Such a vibration dampening tube  67  preferably absorbs vibration, shocks, jolts, impacts and the like encountered during such abrasive surface finishing or treatment using rotary brush  20  or  20 ′ of the invention thereby reducing the magnitude of vibration, shocks, jolts, impacts and the like which are actually transmitted from the brush  20  or  20 ′ to the rotary power tool used to rotate the brush  20  or  20 ′ in turn thereby advantageously reducing the magnitude of the vibration, shocks, jolts, impacts and the like transmitted to one or both hands of the operator manually holding the rotary power tool. Reducing via dampening or absorption by vibration dampening tube  67  of the magnitude of at least some of vibration, shocks, jolts, impacts and the like generated during surface finishing with rotating brush  20  or  20 ′ transmitted to one or both hands of the operator grasping the rotary power tool rotating the brush  20  or  20 ′ even further reduces and preferably minimizes operator fatigue, even further reduces and preferably prevents hand and forearm strain, and/or even further helps reduce, minimize and preferably substantially completely prevent one or more other repetitive stress related injuries often experienced by such rotary brush operators. 
     A vibration isolating rotary brush  20  or  20 ′ of the present invention also has at least one axial vibration isolator  64   a  and/or  64   b  that isolates, preferably axially isolates, at least some vibration, shocks, jolts, impacts and the like produced, encountered or experienced by wires  41 , bristles  43  and/or hub  38  of the rotating brush  20  or  20 ′ from at least part of the coupling  58 , preferably from at least part of the shaft  68  of the coupling  58 , during abrasive surface treatment thereby advantageously preventing at least some of the vibration, shocks, jolts, impacts and the like from being transmitted to the hands of an operator holding and using the rotary power tool to which the brush  20  is mounted. Doing so advantageously reduces, preferably minimizes, and more preferably helps prevent operator stress, strain, and fatigue, including with respect to hand-related strains, stresses, inflammation, other injuries and the like. The vibration isolating brush  20  or  20 ′ of the present invention preferably has at least one axial vibration isolator  64   a  and/or  64   b  that also is configured as a vibration dampener  71   a  and/or  71   b , which in addition to providing vibration isolation, also dampens at least some vibration, shocks, jolts, impacts and the like produced, encountered or experienced by the wires  41  or bristles  43  and/or hub  38  of the rotating brush  20  or  20 ′ from at least part of the coupling  58 , preferably from at least part of the shaft  68 , during abrasive surface treatment by reducing the magnitude or amplitude of the vibration, shocks, jolts, impacts and the like actually transmitted to the hands of an operator holding and using the rotary power tool to which the brush  20  is mounted. Doing so advantageously further reduces, preferably even further minimizes, and/or more preferably even further helps prevent operator stress, strain, and fatigue including with respect to hand-related strains, stresses, inflammation, other injuries and the like. 
     Where equipped with one or more axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b , at least one of the axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b  of the rotary brush  20  or  20 ′ of the invention is disposed axially between (a) one portion of the coupling  58  disposed at or adjacent an end of the coupling  58  releasably mounted to hand-held rotary power tool, e.g., grinder, drill, etc., and one portion of at least one of the cups  28  and/or  30  and/or the hub  38  disposed adjacent thereof, and/or (b) another portion of the coupling  58  disposed at or adjacent the opposite end of the coupling  58 , and another portion of at least one of the cups  28  and/or  30  and/or the hub  38  of the brush  20  or  20 ′ disposed adjacent thereof. Each one of the axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b  of the rotary brush  20  or  20 ′ of the invention is positioned between an axial surface of the coupling  58  and an axial surface of an adjacent one of the cups  28  and/or  30  and/or the hub  38 . Each one of the axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b  of the rotary brush  20  or  20 ′ of the invention is positioned between an axial surface of the coupling  58  and an opposing axial surface of an adjacent one of the cups  28  and/or  30 . 
     Where equipped with one or more axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b , at least one of the axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b  is disposed axially between (a) one of the cups  28 , e.g., inner cup  28 , and an adjacent first or upper annular brush cup or hub retainer flange  70  formed integrally of part of, carried by, or in operable cooperation with the shaft  68  of the coupling  58  disposed at or adjacent a brush component assembly end  77  of the coupling  58 , and/or (b) another one of the cups  30 , e.g., outer cup  30 , and a second or lower brush cup or hub retainer flange  72  formed integrally of part of, carried by, or in operable cooperation with the coupling  58  located at or adjacent a free end or power tool coupling end  75  configured for removable attachment to a hand-held rotary power tool. Each one of the axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b  of the rotary brush  20  or  20 ′ of the invention is located axially between an axial surface of one of the flanges  70  or  72  and an axial surface of an adjacent one of the cups  28  and  30 . Each one of the axial vibration isolators  64   a  and/or  64   b  and/or axial vibration dampeners  71   a  and/or  71   b  of the rotary brush  20  or  20 ′ of the invention is located axially between an axial surface of an adjacent flange  70  or  72  of the coupling  58  and an opposing axial surface of an adjacent one of the cups  28  and  30 . 
     A preferred vibration isolating rotary brush  20  or  20 ′ of the present invention is equipped with a plurality of axial vibration isolators  64   a ,  64   b  having (a) one annular upper vibration isolator  64   a  located between (i) an annular cup and hub retainer flange  70  of the coupling shaft  68 , and (ii) an adjacent one of the cups  28 , and (b) another annular lower vibration isolator  64   b  located between (i) an annular tool coupling flange  72  of the shaft  68 , and (ii) an adjacent one of the cups  30 . One such preferred vibration isolating rotary brush  20  or  20 ′ of the invention includes a pair of axial vibration isolators  64   a ,  64   b  having (a) one annular upper vibration isolator  64   a  located between (i) an axial surface of an annular cup and hub retainer flange  70 , and (ii) an opposed axial surface of an one of the cups  28 , and (b) another annular lower vibration isolator  64   b  located between (i) an axial surface of an annular tool coupling flange  72 , and (ii) an opposed axial surface of the other one of the cups  30 . 
     In one preferred embodiment, the cup brush  20  or  20 ′ is equipped with both (a) an annular upper axial isolator  64   a  and/or axial dampener  71   a  disposed between (i) the annular cup brush component assembly flange  70  of the shaft  68  of the coupling  58  disposed at or adjacent an upper end of the coupling  58 , e.g., at or adjacent brush cup engaging end  77  of the coupling  58 , and (ii) the bottom wall  34  of the inner cup  28  of the brush  20  or  20 ′, and (b) an annular lower axial isolator  64   b  and/or axial dampener  71   b  disposed between (i) the tool coupling end  75  and brush cup engaging end  77  of the shaft  68  of the coupling  58 , and (ii) the bottom wall  36  of the outer cup  30  of the brush  20  or  20 ′. A preferred cup brush  20  or  20 ′ is equipped with both (a) an annular upper axial isolator  64   a  and/or axial dampener  71   a  located between (i) the annular cup and hub retainer flange  70  of the shaft  68  of the coupling  58  located at or adjacent an upper end of the coupling  58 , e.g., at or adjacent brush cup engaging end  77  of the coupling  58 , and (ii) the bottom wall  34  of the inner cup  38 , and (b) an annular lower axial isolator  64   b  and/or axial dampener  71   b  located between (i) the coupling end flange  72  at the tool coupling end  75  of the shaft  68  of the coupling  58  and (ii) the bottom wall  36  of the outer cup  30 . 
     Where equipped with an upper axial isolator  64   a  and/or upper axial dampener  71   a , the upper axial isolator  64   a  and/or upper axial dampener  71   a  is captured between the upper brush component assembly flange  70  and the bottom wall  34  of the inner cup  28 . The brush  20  or  20 ′ is assembled with the flange  70  overlapping the upper axial isolator  64   a  and/or upper axial dampener  71   a  and with the upper axial isolator  64   a  and/or upper axial dampener  71   a  overlapping part of the bottom wall  34  of the inner cup  28 . Where equipped with a lower axial isolator  64   b  and/or lower axial dampener  71   b , the lower axial isolator  64   b  and/or lower axial dampener  71   b  is captured between the bottom wall  36  of the outer cup  30  and the lower coupling flange  72 . The brush  20  or  20 ′ is assembled with flange  72  overlapping the lower axial isolator  64   b  and/or lower axial dampener  71   b  and with the lower axial isolator  64   b  and/or lower axial dampener  71   b  overlapping part of the bottom wall  36  of the outer cup  30 . 
     In one such preferred embodiment, the brush  20  or  20 ′ is equipped with both (a) an annular upper axial isolator  64   a  and/or axial dampener  71   a  disposed between (i) the upper brush component retaining flange  70  and (ii) an upper or outer surface the bottom wall  36  of the inner cup  30 , and (b) an annular lower axial isolator and/or axial dampener  64   b  disposed between (i) the lower annular coupling flange  72  and (ii) a lower or outer surface of the bottom wall  34  of the outer cup  28 . The bottom wall  34  of the inner cup  28  overlaps the hub  38 , the hub  38  overlaps the bottom wall  36  of the outer cup  30  and the bottom wall  34  of the inner cup  28 , the hub  38 , and the bottom wall  36  of the outer cup  30  are disposed between the upper and lower flanges  70 ,  72  of the shaft  68  of the coupling  58  with the upper axial isolator  64   a  and/or axial dampener  71   a  disposed between upper flange  70  and inner cup bottom wall  34 , and the lower axial isolator  64   b  and/or axial dampener  71   b  disposed between lower flange  72  and outer cup bottom wall  36 . 
     Where the rotary cup brush  20  or  20 ′ is equipped with an upper axial isolator  64   a  and/or axial dampener  71   a , the upper axial isolator  64   a  and/or axial dampener  71   a  is annular and can be in the form of an upper annular or ring-shaped vibration isolating and/or vibration dampening, e.g., vibration absorbing, washer  65 , which can be telescoped over part of the shaft  68  and/or seated against or on the cup and hub retainer flange  70  of the shaft  68  of the coupling  48 . If desired, the vibration isolating and/or vibration absorbing washer  65  can be integrally formed of the vibration isolating tube  66 , like depicted in  FIG. 4 . If desired, the vibration isolating and/or vibration absorbing washer  65  can be a flange that extends radially outwardly from or adjacent the vibration isolating tube  66 . Where equipped with a lower axial isolator and/or axial dampener  64   b , the lower axial isolator and/or axial dampener  64   b  is annular and can be in the form of a lower annular or ring-shaped vibration isolating and/or vibration dampening, e.g., vibration absorbing, washer  69  which can be telescoped over part of the shaft  68  and/or seated against or on the lower annular coupling flange  72  of the coupling  48 . If desired, the vibration isolating and/or vibration absorbing washer  69  can be a flange that extends radially outwardly from or adjacent the vibration isolating tube  66 . 
     If desired, the isolator or dampener of a preferred rotary cup brush  20  or  20 ′ can alternatively be constructed or configured as a tubular isolating or dampening grommet of one-piece construction having (a) a radially outwardly generally annular flange at one end that is or forms the upper axial isolator and/or axial dampener  64   a , (b) a radially outwardly generally annular flange at an opposite end that is or forms the lower axial isolator and/or axial dampener  64   b , and (c) a tubular sidewall or grommet body extending therebetween that defines or forms the radial isolating or dampening tube  66 . Where provided in the form of a vibrational isolating or vibration dampening grommet,  66  is a tubular radial vibration isolating and/or radial vibration dampening grommet sidewall,  64   a  is an upper axial vibration isolating and/or axial vibration dampening flange extending radially outwardly at or about one end of the radial vibration isolating or radial vibration dampening grommet sidewall at or adjacent one end of the grommet, and  64   b  is a lower axial vibration isolating and/or axial vibration dampening flange extending radially outwardly at or about an opposite end of the radial vibration isolating or radial vibration dampening grommet sidewall at or adjacent an opposite end of the grommet. 
     With continued reference to  FIGS. 1-4 , the lower coupling flange  72  of the rotary power tool coupling  58  is disposed between the lower end of the coupling shaft  68  and a coupling head  74  extending axially outwardly from the bottom  34  of the outer cup  28  that is configured for releasable or removable coupling with a hub or spindle of a rotary prime mover that preferably is a grinder, e.g., angle grinder, a rotary drill, or another type of suitable rotary power tool known in the art. As also depicted by  FIGS. 1-4 , a preferred rotary power tool coupling  58  is elongate and has an internal bore  76 , at least part of which is an internally threaded bore  78 , such as for threadable coupling or attachment to the rotary spindle or hub of a rotary brush drive, e.g., grinder, drill, etc., and which preferably is an elongate bore, which can and preferably does extend all the way through the elongate generally tubular coupling  58 , and which is generally coaxial with a center axis of rotation of the cup brush  20 . 
     In a preferred embodiment, the rotary power tool coupling  58  is formed with a coupling nut assembly  80  formed of a rotary power tool spindle coupling nut  82  disposed exteriorly of the cups  28  and  30  of the cup brush  20  with the nut  82  preferably abutting against the bottom  34  of the outer cup  28  and formed with at least a pair of oppositely disposed tool gripping flats  84  and an internally threaded bore  78  configured to receive an externally threaded spindle or hub of a hand-held rotary power tool used to removably attach the brush  20 . In one embodiment, the shaft  68  of the coupling  58  is integrally formed with the nut  82  such that the coupling  58 , including the coupling nut assembly  80 , is of one-piece, unitary construction that is press-fit through the respective openings  52 ,  54  and  56  in cups  28 ,  30  and brush wire hub  38  capturing (a) the upper axial vibration isolator and/or upper axial vibration dampener  64   a  between the upper coupling flange  70  and bottom wall  34  of inner brush cup  28 , (b) the radial vibration isolator and/or radial vibration dampener  62  radially between the shaft  68  and inner cup and hub edges defining openings  52 ,  54  and  56  of cups  28  and  30  and hub  38 , and (c) the lower axial vibration isolator and/or upper axial vibration dampener  64   b  between the lower coupling flange  72  and the bottom wall  36  of outer brush cup  30 . In another preferred embodiment, the shaft  68  can either be threadably engaged, press-fittingly engaged, snap-fittingly engaged, or otherwise engaged or attached in another manner with the head  74  or nut  82  of the coupling  58 . 
     It is contemplated that a vibration isolating and/or vibration dampening rotary cup brush  20  of the present invention can also be configured with a perforate brush wire hub  38  like that depicted in  FIG. 4  which has circumferentially spaced apart holes  40  each having an elongate brush wire tuft  42  extending outwardly therefrom. Each tuft  42  is formed of elongate wires extending through a corresponding hole  40  in the hub  38  which are twisted to form a twisted tuft  42  like the twisted tufts  42  of a vibration isolating twisted knot rotary wire cup brush  20 ′ of the present invention shown in  FIG. 3 . With continued reference to  FIG. 3 , a preferred embodiment of a vibration isolating twisted knot cup brush  20 ′ of the present invention has twisted wire tufts  42  each formed of wires that extend through a corresponding hole  40  in the hub  38  and which are twisted in a manner to form a twisted knot (not shown) used to anchor the tuft  42  to the hub  38 . Such a vibration isolating twisted knot cup brush  20 ′ of the present invention can have tufts  42  of standard twist knot construction, cable twist knot construction, or even stringer bead twist knot construction with the tufts  42  respectively attached to the hub  38  of the twisted knot cup brush  20 ′ with standard twist knots, cable twist knots, or stringer bead twist knots. Where a vibration isolating twisted knot cup brush  20 ′ of the present invention is formed with brush tufts  42  of twisted tuft or twisted knot construction, each brush tuft  42  preferably is composed of at least a plurality of pairs, i.e., at least three wires, twisted and/or braided together to form the tuft  42 . In one preferred embodiment, each tuft  42  of such a vibration isolating cup brush  42  of the present invention is formed of between twenty wires and forty wires, which are twisted together along at least about two-thirds the length of the tuft  42  and which can also be braided. In one preferred embodiment, at least a plurality of tufts of the vibration isolating twisted knot cup brush  20 ′ have tufts  42 , and preferably all of the tufts  42  of the cup brush  20 ′ are formed of at least a plurality, preferably at least a plurality of pairs, i.e., at least three, wires each formed of at least a plurality, preferably at least a plurality of pairs, i.e., at least three, strands, which are braided and/or twisted together along substantially the full length of the wire. In one such preferred embodiment, at least a plurality of tufts of the vibration isolating twisted knot cup brush  20 ′ have tufts  42 , and preferably all of the tufts  42  of the cup brush  20 ′ are formed of at least a plurality, preferably at least a plurality of pairs, i.e., at least three, wires each formed of at least a plurality, preferably at least a plurality of pairs, i.e., at least three, strands, which are braided and/or twisted together along substantially the full length of the wire, with such multi-stranded wires braided together, twisted together, or braided and twisted together along substantially the entire length of the tuft  42 . 
     A rotary cup brush  20  or  20 ′ of vibration isolating and/or vibration damping construction in accordance with the present invention advantageously significantly reduces the amount of vibration transmitted from the rotating cup brush  20  or  20 ′ during abrasive material removal thereby during surface treatment or surface finishing thereby advantageously reducing, preferably minimizing and/or more preferably helping to prevent occurrence of vibration-induced white finger (VWF) in an operator holding by hand a hand-operated rotary brush drive, such as a grinder, e.g., angle grinder, drill, or the like to which the cup brush  20  or  20 ′ is attached. Such a rotary cup brush  20  or  20 ′ of such axial and/or radial vibration isolating and/or vibration dampening construction also helps reduce vibration transmitted to the hand(s) of an operator manually grasping such a hand-held rotary brush drive to which the cup brush  20  or  20 ′ is mounted thereby advantageously also helping to reduce, preferably minimize, and more preferably help prevent other vibration-induced changes in tendons, muscles, bones, joints and/or the nervous system, collectively known as Hand-Arm Vibration Syndrome (HAVS), in such rotary brush drive, e.g., vibratory tool, operators. 
     The present invention is directed to a rotary abrasive implement that is a rotary abrasive brush having a hub from which a plurality of pairs of elongate brush wires outwardly extends, at least one three-dimensionally formed plate disposed in operable cooperation with the hub that helps support a portion of at least a plurality of the brush wires, and a vibration isolator disposed in operable cooperation with at least one of the hub and the plate in providing vibration isolation to an operator of a hand-held rotary power tool rotating the rotary brush during contact with a surface being treated or finished causing abrasive material of or from the surface. The vibration isolator preferably is of elastomeric construction. The vibration isolator is made of an elastomeric material. The vibration isolator is made of an elastomer. 
     The present invention is directed to a rotary abrasive implement that is a rotary abrasive brush having a hub from which a plurality of pairs of elongate brush wires outwardly extends, at least one plate disposed in operable cooperation with the hub, and a vibration isolator disposed in operable cooperation with at least one of the hub and the plate in providing vibration isolation to an operator of a hand-held rotary power tool rotating the rotary brush during contact with a surface being treated or finished causing abrasive material of or from the surface. The vibration isolator is disposed between the hub and the at least one plate. The rotary abrasive implement is a rotary brush that preferably is a rotary cup brush where the at least one plate disposed in operable cooperation with the hub supports or helps support a portion of at least a plurality of the brush wires. The vibration isolator is disposed between the hub and the at least one plate. The at least one plate of the cup brush can be a three-dimensionally contoured or shaped plate that is disposed in operable cooperation with the hub and supports wires of the cup brush. The vibration isolator is disposed between the hub and the at least one plate. 
     One rotary abrasive implement is a rotary brush having crimped brush wires or brush wires which can be and preferably are twisted and arranged in brush wire tufts which extend outwardly from the hub. The at least one plate disposed in operable cooperation with the hub supports at least a portion of each one of the brush wire tufts. The at least one plate disposed in operable cooperation with the hub is three-dimensionally contoured or shaped and supports at least a portion of each one of the brush wire tufts. The vibration isolator is disposed between the hub and the at least one plate. 
     Another rotary abrasive implement is a rotary cup brush having crimped brush wires or brush wires which are twisted and arranged in tufts which extend outwardly from the hub. The at least one plate disposed in operable cooperation with the hub supports at least a portion of each one of the brush wire tufts. The at least one plate disposed in operable cooperation with the hub is three-dimensionally contoured or shaped and supports at least a portion of each one of the brush wire tufts. The vibration isolator is disposed between the hub and the at least one plate. 
     A rotary cup brush equipped with twisted wire brush tufts can be and preferably is attached or anchored to the hub with a twist knot that can be one of a standard twist knot, a cable twist knot, and a stringer bead twist knot. The at least one plate disposed in operable cooperation with the hub supports at least a portion of each one of the brush wire tufts. The at least one plate disposed in operable cooperation with the hub is three-dimensionally contoured or shaped and supports at least a portion of each one of the brush wire tufts. The vibration isolator is disposed between the hub and the at least one plate. 
     Such a vibration-isolating rotary abrasive implement is a rotary brush that further includes a rotary power tool coupling disposed in operable cooperation with at least one of the hub and the plate, and wherein the vibration isolator vibrationally isolates the rotary power tool coupling from at least one of the hub and the plate. The vibration isolator vibrationally isolates the rotary power tool coupling from at least the hub. The vibration isolator is disposed between the rotary power tool coupling and at least the hub. The vibration isolator spaces at least the hub from the rotary power tool coupling preventing direct contact therebetween. In a preferred embodiment, the vibration isolator isolates the rotary power tool coupling from both the hub and the plate. The vibration isolator preferably is of elastomeric construction. The vibration isolator is made of an elastomeric material. The vibration isolator is made of an elastomer. 
     In a preferred embodiment, the vibration isolator includes at least one radial vibration isolator. The at least one radial vibration isolator preferably is of elastomeric construction. The at least one radial vibration isolator is made of an elastomeric material. The at least one radial vibration isolator is made of an elastomer. In another preferred embodiment, the vibration isolator includes at least one axial vibration isolator. The at least one axial vibration isolator preferably is of elastomeric construction. The at least one axial vibration isolator is made of an elastomeric material. The at least one axial vibration isolator is made of an elastomer. The vibration isolator includes at least one radial vibration isolator and at least one axial vibration isolator. The at least one radial vibration isolator and the at least one axial vibration isolator are of elastomeric construction. The at least one radial vibration isolator and the at least one axial vibration isolator are made of an elastomeric material. The at least one radial vibration isolator and the at least one axial vibration isolator are made of an elastomer. 
     Where the rotary brush is a rotary cup brush, the plate preferably is a three-dimensionally formed or three-dimensionally shaped plate. The three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. A preferred three-dimensionally formed plate of the vibration-isolating cup brush is concave. The concave three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. Another preferred three-dimensionally formed plate is generally cup-shaped. The cup-shaped three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. Still another preferred three-dimensionally formed plate is concave and generally cup-shaped. The concave, generally cup-shaped three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. 
     A preferred rotary cup brush has a pair of the cups with one of the cups nested within another one of the cups, has the hub disposed or located between the cups, and the vibration isolator is disposed or located between the cups. Another preferred cup brush has a pair of the cups with one of the cups nested within another one of the cups, the hub is disposed or located between the cups, the vibration isolator is disposed or located between the cups, and the vibration isolator is disposed between the rotary power coupling and each one of the cups and the hub. 
     The vibration isolator includes at least one radial vibration isolator. The at least one radial vibration isolator is disposed or located between the rotary power tool coupling and at least one of the cups. The at least one radial vibration isolator is disposed or located between the rotary power tool coupling and each one of the cups. The at least one radial vibration isolator is disposed or located between the rotary power tool coupling and the hub. The at least one radial vibration isolator is disposed or located between the rotary power tool coupling and at least one of the cups and the hub. The at least one radial vibration isolator is disposed or located between the rotary power tool coupling, each one of the cups, and the hub. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     The vibration isolator includes at least one axial vibration isolator. The at least one axial vibration isolator includes a pair of axial isolators The at least one axial vibration isolator is disposed or located between the rotary power tool coupling and each one of the cups. The at least one axial vibration isolator is disposed or located between the rotary power tool coupling and the hub. The at least one axial vibration isolator is disposed or located between the rotary power tool coupling and at least one of the cups and the hub. The at least one axial vibration isolator is disposed or located between the rotary power tool coupling, each one of the cups, and the hub. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     Where the at least one axial vibration isolator includes a pair of axial isolators, one of the axial vibration isolators is disposed axially between the rotary power tool coupling and one of the cups, and the other one of the axial vibration isolators is disposed axially between the rotary power tool coupling and the other one of the cups. The at least one radial vibration isolator is disposed or located radially between the rotary power tool coupling and at least one of the cups or the hub. The at least one radial vibration isolator is disposed or located radially between the rotary power tool coupling and each cup. The at least one radial vibration isolator is disposed or located radially between the rotary power tool coupling and at least one of the cups and the hub. The at least one radial vibration isolator is disposed or located radially between the rotary power tool coupling, the cups, and the hub. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     The at least one radial vibration isolator includes a tubular radial vibration isolator. The tubular radial vibration isolator is carried by the rotary power tool coupling. The tubular radial vibration isolator is disposed or located between the rotary power tool coupling and the hub. The tubular radial vibration isolator is disposed or located radially between the rotary power tool coupling and the hub. The tubular radial vibration isolator is disposed radially outwardly of the rotary power tool coupling. The tubular radial vibration isolator is disposed radially inwardly of the hub. The tubular radial vibration isolator is disposed radially outwardly of the rotary power tool coupling and radially inwardly of the hub. The tubular radial vibration isolator prevents the rotary power tool coupling from direct contact with the hub. The tubular radial vibration isolator prevents the rotary power tool coupling from direct radial contact with the hub. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     The tubular radial vibration isolator is or includes a vibration isolating tube. The vibration isolating tube is telescoped over at least a portion of the rotary power tool coupling. The vibration isolating tube is telescoped over the rotary power tool coupling. The vibration isolating tube radially vibrationally isolates the hub and the cups from the rotary power tool coupling. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     The at least one axial vibration isolator is formed of or includes a pair of axial vibration isolators axially spaced apart with one of the axial vibration isolators disposed or located axially between the rotary power tool coupling and one of the cups of the rotary cup brush and the other one of the axial vibration isolators disposed or located axially between the rotary power tool coupling and the one of the cups of the rotary cup brush. One of the axial vibration isolators is carried by or disposed at one end of the vibration isolating tube and the other one of the axial vibration isolators is carried by or disposed at an opposite end of the vibration isolating tube. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     The vibration isolator includes at least one radial vibration isolator and at least one axial vibration isolator. The at least one radial vibration isolator and the at least one axial vibration isolator is disposed or located between the rotary power tool coupling and at least one of the cups. The at least one radial vibration isolator and the at least one axial vibration isolator is disposed or located between the rotary power tool coupling and each one of the cups. The at least one radial vibration isolator and the at least one axial vibration isolator is disposed or located between the rotary power tool coupling and the hub. The at least one radial vibration isolator and the at least one axial vibration isolator is disposed or located between the rotary power tool coupling and at least one of the cups and the hub. The at least one radial vibration isolator and the at least one axial vibration isolator is disposed or located between the rotary power tool coupling, each one of the cups, and the hub. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     One such preferred vibration-isolating rotary brush is a vibration-isolating cup brush having the at least one plate that is a three-dimensionally formed plate further includes a rotary power tool coupling disposed in operable cooperation with at least one of the hub and the three-dimensionally formed plate, and wherein the vibration isolator vibrationally isolates the rotary power tool coupling from at least one of the hub and the three-dimensionally formed plate. The vibration isolator vibrationally isolates the rotary power tool coupling from at least the hub. The vibration isolator is disposed between the rotary power tool coupling and at least the hub. The vibration isolator spaces at least the hub from the rotary power tool coupling preventing direct contact therebetween. In a preferred embodiment, the vibration isolator isolates the rotary power tool coupling from both the hub and the three-dimensionally formed plate. Where the rotary brush is a rotary cup brush and the plate preferably is a three-dimensionally formed or three-dimensionally shaped plate. The three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. A preferred three-dimensionally formed plate of the vibration-isolating cup brush is concave. The concave three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. Another preferred three-dimensionally formed plate is generally cup-shaped. The cup-shaped three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. Still another preferred three-dimensionally formed plate is concave and generally cup-shaped. The concave, generally cup-shaped three-dimensionally formed or three-dimensionally-shaped plate is a cup of the rotary brush cup. A preferred rotary cup brush has a pair of the cups with one of the cups nested within another one of the cups, has the hub disposed or located between the cups, and the vibration isolator is disposed or located between the cups. Another preferred cup brush has a pair of the cups with one of the cups nested within another one of the cups, the hub is disposed or located between the cups, the vibration isolator is disposed or located between the cups, and the vibration isolator is disposed between the rotary power coupling and each one of the cups and the hub. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     The at least one axial vibration isolator is formed of or includes a pair of axial vibration isolators axially spaced apart with one of the axial vibration isolators disposed or located axially between the rotary power tool coupling and one of the cups of the rotary cup brush and the other one of the axial vibration isolators disposed or located axially between the rotary power tool coupling and the one of the cups of the rotary cup brush. One of the axial vibration isolators is carried by or disposed at one end of the vibration isolating tube and the other one of the axial vibration isolators is carried by or disposed at an opposite end of the vibration isolating tube. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     In a preferred embodiment, the vibration isolator is a vibration dampener. Each axial vibration isolator is, includes, defines or forms a vibration dampener. Each radial vibration isolator is, includes, defines or forms a vibration dampener. Where a radial vibration isolator is in the form of a vibration isolating tube, the vibration isolating tube is, includes, defines or forms a vibration dampener. The rotary abrasive implement is a rotary brush. The rotary brush is a cup brush. 
     The present invention is directed to a rotary brush that includes (a) a hub from which a plurality of pairs of elongate brush wires or brush wire tufts outwardly extend (b) at least one three-dimensionally formed plate disposed in operable cooperation with the hub that supports or helps support a portion of at least a plurality of the brush wires or brush wire tufts; (c) a coupling operatively connected to the hub and the at least one three-dimensionally formed plate in forming a rotary brush assembly, and (d) a vibration isolator vibrationally isolating the coupling from the hub. The vibration isolator is or includes an axial vibration isolator that axially isolates the coupling from the hub, and a radial vibration isolator that radially isolates the coupling from the hub. The radial vibration isolator is tubular and carried by part of the coupling (i) disposed or located radially outwardly of the coupling, and (ii) disposed or located radially inwardly of the hub. The radial vibration isolator is tubular and carried by part of the coupling disposed or located radially outwardly of the coupling and radially inwardly of the hub. 
     The axial vibration isolator is disposed or located between the coupling and the at least one three-dimensionally formed plate that is operatively connected to the hub by the coupling. The at least one three-dimensionally formed plate is or includes a generally concave generally circular rotary brush cup along with brush wires extend from the hub outwardly thereof, and wherein the rotary brush is a rotary cup brush. The axial vibration isolator is disposed axially between the rotary brush cup and an axial surface of the coupling disposed adjacent the rotary brush cup. The axial vibration isolator prevents direct axial contact between the axial surface of the coupling and the rotary brush cup. The axial vibration isolator is annular. 
     The coupling includes an elongate shaft, the at least one three-dimensionally formed plate is formed of or includes a pair of generally coaxially nested concave generally circular rotary brush cups each having a generally circular cup bottom wall with a coupling opening formed therein, and a cup sidewall extending radially and axially outwardly from the bottom wall about the periphery of the bottom wall, and the hub is disposed or located interjacent the bottom walls of the rotary brush cups, the hub having a coupling opening formed therein generally coaxial with the coupling openings formed in the bottom walls of the respective rotary brush cups. The vibration isolator is or includes a radial vibration isolator carried by at least a portion of the shaft, the tubular radial vibration isolator is disposed or located radially outwardly of the shaft and radially inwardly of the cups and the hub. The radial vibration isolator is disposed between radially opposed surfaces of the shaft and the plates and hub. The radial vibration isolator is configured to radially space the shaft from the plates and hub preventing direct contact therebetween thereby preventing transmission of radial vibration from one of the hub and plates to the shaft and to the rotary tool removably coupled by the shaft to the rotary brush. 
     The radial vibration isolator is or includes radial vibration isolating tube that is received over part of the shaft. The radial vibration isolating tube is telescoped of part of the shaft between the flanges of the shaft. The radial vibration isolating tube extends between the flanges from one of the flanges to the other one of the flanges of the shaft of the rotary coupling. 
     The vibration isolator further includes a pair of spaced apart axial vibration isolators with (a) one of the axial vibration isolators disposed between (i) an upper rotary brush assembly coupling flange of the coupling disposed in operable cooperation with one of the rotary brush cups, and (ii) the one of the rotary brush cups, and (b) the other one of the axial vibration isolators disposed between (i) a lower rotary brush assembly coupling flange of the coupling disposed in operable cooperation with the other one of the rotary brush cups, and (ii) the other one of the rotary brush cups. The tubular radial vibration isolator is or includes a radial vibration isolating tube, and the pair of axial vibration isolators form or includes annular vibration isolators through which part of the shaft extends with one of the annular vibration isolators disposed or located between the upper rotary brush assembly coupling flange and the bottom wall of the one of the rotary brush cups, and the other one of the annular vibration isolators disposed or located between the lower rotary brush assembly coupling flange and the bottom wall of the other one of the rotary brush cups. 
     The coupling is or defines a rotary power tool coupling. The coupling further includes an internally threaded nut disposed or located at an opposite end of the shaft which is in turn disposed or located against or adjacent the bottom wall of the other one of the rotary brush cups. 
     Understandably, the present invention has been described above in terms of one or more preferred embodiments and methods. It is recognized that various alternatives and modifications can be made to these embodiments and methods that are within the scope of the present invention. It is also to be understood that, although the foregoing description and drawings describe and illustrate in detail one or more preferred embodiments of the present invention, to those skilled in the art to which the present invention relates, the present disclosure will suggest many modifications and constructions as well as widely differing embodiments and applications without thereby departing from the spirit and scope of the invention. The present invention, therefore, is intended to be limited only by the scope of the appended claims.