CN1008894B - Disposable polishers with integrally mounted hubs - Google Patents

Abstract

A single use grinding tool, such as a hollow grinding wheel, mounted on a rotatable spindle of a power tool, has a retaining nut on one side and a support flange on the other side, which are non-removably secured to the grinding wheel without the use of an adhesive, the grinding wheel being operatively secured to the spindle. The grinding wheel is placed under compression under a grinding load. The nut is secured to the flange by upsetting it against one end of the nut so that it projects outwardly beyond the outer surface of the flange. The base assembly is loosely secured to the spindle and is engageable with the outer surface of the support flange during operation of the grinding wheel. Alternatively, a back cover is secured to the outer projecting portion of the nut and is engageable with both of the spindle shoulders during operation of the grinding wheel.

Description

This invention relates to abrasive working articles, and more particularly to polishing implements having permanently fixed mounting hubs, the composite of which is adapted to be mounted to a suitable portable power tool. More specifically, the invention applies to single-use concave grinding wheels.

The use of rotatably driven buffing implements in the industry is common and well known. One of the very serious problems encountered in the use of such appliances is that of providing effective means for preventing accidental disengagement of polishing appliances such as grinding wheels from the shafts, spindles, or other rotatable transmissions on which they are mounted. . This problem is all the more acute when the connection between the polisher and its drive shaft is required to be detachable for quick exchange of the polisher. A large number of devices are of this type, for example, portable power grinders, which use grinding wheels which are required to be detachable from the power drive shaft for easy replacement. In order to properly install the grinding wheel on the spindle, means must be provided to provide sufficient clamping force and to hold the grinding wheel in a rotatable manner.

A means for securing a grinding wheel to a drive shaft, provided with a suitable support flange having a central hole aligned with the hole in the abrasive wheel. A bolt or nut (depending on the construction of the drive shaft, i.e. whether it is externally or internally threaded) is threaded through the front of the grinding wheel and tightened in place. In this way multiple parts are assembled into a complete assembly ready for application. When using grinding wheels, it should be able to provide proper clamping force to firmly fix the grinding wheel to the drive shaft. However, such assembly generally requires suitable tools such as wrench to remove the grinding wheel from the drive shaft. This device is described in US-3,596,415; US-1,998,919; US-566,883; US-507,223; US-1,162,970; US-791,159; -489, 149; US-3, 210, 892.

Therefore, it is desirable to permanently fix the mounting hub to the grinding wheel so that the entire unit can be simply and quickly mounted to the drive shaft, or the grinding wheel can be removed and thrown away when worn. These types of outfits It is customary to use an adhesive such as epoxy resin between the support flange and the back of the grinding wheel to maintain the integrity of the mounting hub and the grinding wheel, so that the grinding wheel is fixed in a rotatable manner.

Although the bond works well in most applications, it has been found that in some cases the bond becomes loose and the grinding wheel rotates relative to the mounting hub, especially in the case where the hub is a single part and It has an internal thread against which a protrusion is upset and fixed in place with the grinding wheel, thus providing a fixed clamping force to hold the grinding wheel in place. During use of the grinding wheel, no additional clamping force is applied to the further rotation of the wheel, as described above for securing from the front with conventional nuts. As a result, various pin slots and corresponding pin configurations have been developed between the grinding wheel and mounting hub and used in combination with adhesives to preclude rotation between the mounting hub and grinding wheel. Examples of such devices are seen in U.S. Patents US-3,136,100; US-4,015,371; US-2,278,301; US-3,081,584; US-3,500,592; 3,800,483; US-4,240,230 and US-4,541,205.

Other prior art known to the applicant has U.S. Patent US-3,041,797; US-3,879,178; US-1,724,742; US-3,912,411; US-3,879, 178; US-3,960,516; US-4,026,074; US-4,054,425; US-4,088,729; US-4,601,661; 932; US-2,567,782; US-3,136,100; US-3,218,892; US-3,621,621.

Disposable grinding wheel assemblies in prior art devices, including permanently affixed mounting hubs, generally perform as desired. Certain inherent disadvantages are found in the various devices, and the use of adhesives during manufacture adds additional manufacturing costs such as materials and labor. In some installations, parts must be pinned together and accurately aligned in order to function well. Additionally, with the integral part of the die-cast mounting hub, the support flanges do not exert additional clamping force on the grinding wheel as it is turned by the power tool. In addition, such die-cast mounting hubs are bulky and occupy a lot of space, which greatly increases the weight and additional cost of the product.

According to the present invention, a non-removable transmission member is fixed to the polishing implement for mounting on the rotatable spindle of the power tool. The drive member has a support flange on one side of the polishing tool and a retaining nut placed on the tool on the opposite side of the support flange. solid The fixed nut passes through a hole in the appliance from the front to the rear, the radial flange at one end of the fixed nut is placed on the front of the appliance, and the protrusion protruding from the other end is used to fix the fixed nut and the supporting flange. ground together to the appliance, no adhesive is required here.

A base member is loosely retained on the power tool spindle and engages the outer surface of the support flange for exerting pressure on the support flange when the polisher is in operation.

Alternatively, a gland can be secured to the protruding means. The gland has a central through hole through which the power tool spindle engages the retaining nut.

More specifically, the fixture and base member, or the gland, allow the retaining nut and support flange to hold the implement in compression therebetween when the implement is operatively secured to the power tool spindle.

The descriptions of the attached drawings are as follows:

Fig. 1 is a cross-sectional view of a disposable grinding wheel assembly made in accordance with the principles of the present invention, which assembly is installed in the operating position of the main shaft of a power tool;

Figure 2 is an exploded view of the structure shown in Figure 1;

Figure 3 is a cross-sectional view of a support flange made in accordance with the present invention;

Fig. 4 is a cross-sectional view of a fixing nut made according to the principles of the present invention;

Fig. 5 is a cross-sectional view after the fixing nut shown in Fig. 4 is upset;

Fig. 6 is another structure of the main shaft base assembly for the small grinding wheel made according to the present invention;

Figure 7 is a cross-sectional view of another embodiment of a grinding wheel assembly made in accordance with the principles of the present invention, the assembly having a gland and mounted on the spindle of a power tool in an operating position;

Fig. 8 is a cross-sectional view of the gland made according to the present invention, showing the structure of the gland;

Figure 9 is a cross-sectional view of another embodiment of a disposable grinding wheel assembly made according to the principles of the present invention;

Figure 10 is a cross-sectional view of a cup made in accordance with the present invention;

Figure 11 is a cross-sectional view of a support flange made in accordance with the principles of the present invention;

Figure 12 is a cross-sectional view of a composite support flange cup made in accordance with the present invention;

Fig. 13 is a cross-sectional view of a fixing nut made according to the present invention.

Although the present invention is applicable to any type of single-use power transmission polishing implement, only the use of concave center grinding wheels is described herein. As shown in the drawings, a concave grinding wheel 10 is permanently affixed to a set of disposable transmission components 12 to enable the wheel to be secured to a spindle 14 of a suitable power tool 16 . According to the principle of the present invention, the manufacture of the one-time use installation wheel hub or transmission parts should be considered in this way, that is, when the grinding wheel is placed on the running position of the main shaft 14, the grinding wheel is in a compressed state, and the greater the force that the grinding wheel is subjected to during use, The operating pressure generated is also greater. As a result of the grinding wheel being in this compressed state, the grinding wheel is held on the spindle from flying out, and at the same time, the grinding wheel 10 does not rotate relative to the transmission member, ie the hub 12, due to the applied squeezing or clamping force. However, the construction of the transmission components allows the worn grinding wheel to be easily removed from the spindle and thrown away without the use of hand tools or other tools.

It can be clearly seen from the figure that the grinding wheel 10 has a back side 18 and a front side 20. Viewed from the front side, the grinding wheel is concave, as shown at 22, and has a corresponding central raised portion 24 on the back side. The concave portion of the grinding wheel 10 has a central hole 26 . The concave portion of the grinding wheel 10 ensures that no transmission components or spindles protrude beyond the planar portion 20 of the grinding wheel 10 and thus do not interfere with the workpiece when the grinding wheel 10 is in use.

A support flange 28 is provided which abuts against the raised portion 24 above the rear face 18 of the grinding wheel 10 . The diameter of the flange 28 is smaller than the diameter of the grinding wheel 10 . Support flange 28 has a second central bore 30 aligned with bore 26 of grinding wheel 10 . The support flange 28 is formed with reinforcing ribs 32 and 34 concentric with the hole 30 . The support flange 28 is preferably stamped from sheet metal, although other materials such as hard molded plastic or die-cast metal can of course be manufactured if desired.

As shown in more detail in FIG. 3 , the support flange 28 has an inner surface 36 and an outer surface 38 . The inner surface 36 is configured to face the back 18 of the grinding wheel 10 . A pair of flats 40 and 42 are formed on the inner surface 36 . A flat surface 40 is generally formed on the outer peripheral portion of the support flange 28 . Instead, the plane 42 is arranged away from the plane 40 and moved inwardly towards the hole 30 . The flat surface 40 is in contact with the back 18 of the grinding wheel away from the cove. As the size of the grinding wheel and the manufacturing tolerances of the grinding wheel and flange vary, the flat surface 42 can fit on the grinding wheel 10 On the back side opposite to the concave portion 22.

As can be seen from the drawings, particularly FIG. 3, the ribs 32 and 34 on the outer surface 38 of the support flange 28 are continuously formed. Continuous rib 32 is disposed between planes 40 and 42 and outside the transition region between the concave portion and the remainder of grinding wheel 10 . Instead, the continuous rib 34 is disposed intermediate the hole 30 and the flat surface 42 .

The retaining nut 44 has a hollow body portion 46 with a radially outwardly projecting flange 48 at a first end 50 thereof. At the opposite end of the nut body, i.e. the second end 52 is slightly moved inwardly, there is a groove, such as a continuous groove 54, which is formed after the nut body 46 is inserted into the holes of the grinding wheel 10 and the support flange during assembly. . Threads 56 are formed along the inner surface of the nut body 46 for securing to the threaded spindle 14 of the power tool. Nut 44 passes through grinding wheel bore 26 and bore 30 of flange 28 from front face 20 to rear face 18 of grinding wheel 10 . The end 52 of the nut 44 protrudes from the hole 30 of the flange 28 a distance, but not beyond the top surface of the rib 34 .

After the nut 44 passes through the holes on the grinding wheel 10 and the flange 28 , the end 52 of the nut 44 is subjected to upsetting such as piling operation to form a continuous groove 54 , as shown in FIG. 5 . The upsetting operation causes the nut body 46 to extend outwardly a projection 55 to engage the outer surface 38 of the flange 28 adjacent the through hole 30 and is the only means of securing the flange 28 and nut 44 to the grinding wheel 10. The protrusions 55 are continuous like the grooves 54, and can of course be made discontinuous if necessary. Those skilled in the art can easily understand that the flange 28 and the nut 44 are mechanically fixed to the grinding wheel 10 between the flange 48 and the protrusion 55, and no adhesive is required here.

Nut 44 is preferably fabricated from rolled aluminum stock with flange 48 and threads 56 cut, alternatively it may be formed from aluminum or steel bar stock, or by die casting.

In the illustrated embodiment, in order to properly remove the scrap grinding wheel, a base assembly 60 is provided, comprising a disc 62 having a first surface 64 at least a portion of which is adapted to be in contact with the outer surface of the flange 28. 38 are engaged. Disk 62 is held on spindle 14 by a mount 66 . In the preferred embodiment shown in FIG. 1, the fixing member may be a nylon ring threaded onto the threaded spindle 14. As shown in FIG. Like this, nylon ring 66 keeps disc 62 loosely on the spindle 14 all the time, no matter grinding Whether the wheel stays in place. It can be seen that the first surface 64 of the disc 62 forms continuous ridges 68 and 70 which engage the ribs 34 and 32 on the flange 28, respectively. As shown, these ridges are set downwardly so that the disc defines a cavity into which the nut 44 can be partially retracted in use. The contact between the ribs is essentially a line contact. The grinding wheel 10 is generally relatively easy to remove from the power tool 16 due to the line contact. However, during the buffing process, the waste wheel is sometimes difficult to remove due to the enormous force that the disc 62 can exert.

A plastic washer 67 is interposed between the facing face 65 of the disc 62 and the shoulder 69 of the power tool 16. The washer 67 is preferably made of self-lubricating plastic. The washer 67 serves two functions. The first function is to accommodate power tools 16 of various sizes and shapes. That is, the spindle 14 comes in various lengths, requiring spacers to ensure that the end of the spindle does not protrude beyond the end of the nut 44 . The second function is to facilitate removal of the waste wheel 10 from the power tool 16 . Due to the huge force generated during the polishing process, metal to metal, especially between the same metal surfaces tend to stick or bite, so it takes a lot of force to remove the waste wheel. The self-lubricating dissimilar surfaces between washer 67 and shoulder 69 and between washer 69 and surface 65 allow grinding wheel 10 to separate quickly with minimal force applied. Accordingly, the line contact referred to above facilitates separation of the grinding wheel from the base assembly 60 .

The force required to place the grinding wheel 10 in compression is achieved by the connection between the spindle 14 and the threads 56 of the nut 44 . Referring to FIG. 1, it should be noted that when the grinding wheel is threaded onto the spindle 14, the ridges 68 and 70 engage the ribs 34 and 32 on the flange in a linear fashion. Due to this engagement, the flange experiences a downward force. At the same time, the engagement between the spindle threads 14 and the nut threads 56 pushes the nut upwardly towards the flange 28, placing the grinding wheel under compression. Inspection of the drawings, and in particular FIG. 1, will reveal that when the grinding wheel is in operation, forces are transmitted from the power tool 16 in a downward direction to the washer 67, disc 62 and flat surface 40 of the flange 28. At the same time, an upward force is applied by the flange 48 on the nut 44 . These forces arise due to the threaded engagement between the spindle 14 and the internal threads 56 of the nut 44 and the latter imparting torque to the rotating wheel as the grinding wheel comes into contact with the workpiece. Those skilled in the art will understand that when the grinding wheel 10 is in use contacting a workpiece, additional torque is applied to the grinding wheel, tightening it even further to the spindle 14 . That is to say, when the grinding wheel is in contact with the workpiece and rotates, the nut and the grinding wheel Friction between the centers turns the nut in a tighter direction. Rotation of the nut pushes the nut further toward the flange and applies further force to the flange. The tighter the wheel is tightened, the greater the operating pressure generated and the firmer the grip of the wheel 10 between the support flange 28 and the flange 48 of the nut 44 becomes. As a result of this strong clamping or squeezing, the grinding wheel 10 cannot move relative to the hub or drive member 12 while precluding the grinding wheel from being disengaged from the spindle. It should also be noted that the inner surface 64 of the disc 62 provides a cavity 71 above the top end 52 of the nut 44 . This cavity 71 provides space for the nut to move freely upwardly during operation without being restrained by the power tool or base assembly.

Figure 6 shows an alternative construction similar to Figure 1 that is specifically designed for use with smaller grinding wheels, such as those 5 inches (12.7 cm) in diameter or smaller, the only difference being the circle of the base assembly The disk has a smaller diameter and only engages with the first rib near the through hole of the support flange. As shown, the peripheral surface 82 of the disc 80 engages the top surface of the continuous rib 34 on the support flange 28 . It has been found that small grinding wheels can operate satisfactorily without large support flanges, although it will be understood that small grinding wheels will perform more preferably with large support flanges.

On the other hand, as shown in FIGS. 7 and 8, in order to provide the above-mentioned proper operating pressure on the spent grinding wheel, a gland 90 is snapped into the hub assembly 12 and locked. In this case, the above-mentioned base assembly 60 can be omitted. The gland 90 has a first rear surface 92 that engages the spindle surface 69 of the power tool when the grinding wheel is in the operative position of the power tool 16 . A second, front surface 96 on gland 90 contacts the top surface of continuous rib 34 . Gland 90 is retained on hub assembly 12 by gripping ribs 98 that extend radially inwardly from underhanging shroud 84 on front surface 96 of gland body 84 of gland 90 . Clamping rib 98 catches projection 55 and engages lip 57 on end 52 of retaining nut 44 . At the same time, the surface 74 of the continuous rib 34 of the support flange 28 exerts a radially inward force to hold the retaining rib 98 in position between the lip 57 and the periphery of the support flange around the hole 30. . Gland 90 is preferably made of molded plastic such as polypropylene, polyamide, acetal, or the like. Clamping rib 98 may be continuous or may be discontinuous as indicated by dashed line 99 if desired. An important feature is that the gland can be easily snapped into its locked position before use by the wholesaler or user as shown in Figure 1, or assembled at the factory when required. This ability can To save transportation space, because when the assembled grinding wheel without gland is packed in the packing box, the gland can be placed between the grinding wheels or in the gap between the wheel and the box. In this way, a large number of grinding wheels can be stacked on top of each other and packed in the same box.

It is also understood that the gland 90, once installed, remains on the grinding wheel and is disposed of with the spent wheel.

The force required to place the grinding wheel 10 in compression is generated by the connection of the spindle 14 to the threads 56 of the nut 44 . It will be noted when referring to FIG. 7 that surface 92 and surface 69 engage when the grinding wheel is screwed onto spindle 14 . Thus, force is transferred through the gland 90 to the support flange 28 by the contact of the surface 96 and the rib 34, causing the support flange to be forced downwardly. Simultaneously, the interengagement between the spindle and nut threads 14 and 56 forces the nut upwardly towards the flange 28, placing the grinding wheel under compression. Those skilled in the art will understand that when the grinding wheel is placed on the workpiece, additional torque is applied to further tighten the grinding wheel to the spindle 14 as in the case of the base assembly 60 .

Referring now more specifically to FIGS. 9-13, there is shown another embodiment of a single-use grinding wheel-transmission assembly made in accordance with the principles of the present invention. As shown, a concave grinding wheel 10 is permanently affixed to a disposable transmission member 12 to allow the wheel to be secured to a spindle 14 of a suitable power tool, indicated by phantom line 16 .

As can be clearly seen from the figures, the grinding wheel 10 has a rear face 18 and a front face 20 . Viewed from the front of the grinding wheel, its central portion is inwardly recessed, as shown at 22, with a corresponding central raised portion 24 on its back. The concave portion of the grinding wheel 10 has a central hole 26 .

A support flange 128 is provided which is adapted to abut against raised portion 24 above back 18 of grinding wheel 10 . The diameter of the flange 128 is smaller than the diameter of the grinding wheel 10 . The support flange 128 has a second central through hole 130 aligned with the hole 26 in the grinding wheel 10 . Ribs 132 are formed concentrically with the holes 130 on the support flange 128. The support flange 128 is preferably stamped from sheet metal, but can of course be made of other materials such as hard molded plastic if desired.

The retaining nut 134 has a hollow body portion 136 with a radially outward Extended flange 138. A groove, such as a continuous groove 144 , is formed at the position where the other end 142 of the nut body moves slightly inward. Threads 146 are formed along the inner surface of the nut body 136 for connection to the spindle 14 of the power tool. A nut 134 passes through the wheel bore 26 and the hole 130 in the flange 128 from the front face 20 to the rear face 18 of the wheel 10 .

A hollow cup 150 covers the upper portion of the retaining nut through the flange 28 and is non-detachably held by a portion of which is squeezed into the groove 144 on the nut. As shown, the hollow cup (spindle cup) has a side wall 152 and a radially outwardly extending flange 154 at one end 156 thereof. The opposite end 158 of the side wall 152 is bent inwardly to form a third through hole 160 . The inwardly curved portion of the side wall 152 also acts as a seating area for the spindle 14 of the power tool 16 , making it easier for the user to place the grinding wheel on the power tool 16 . Securing the side wall 152 of the cup 150 to the groove 144 can be accomplished by a simple staking operation, forming the indentations shown at 164 and 166 in FIG. 9 . It will be clear to those skilled in the art that indentations 164 and 166 may be one or more, may be separate, or may be continuously upset on side wall 152 if desired. It should also be understood that the continuous groove 144 can also be formed in a discontinuous manner, that is, a plurality of pits, if desired. In any event, the cup 150 and nut 134 are fixed in a non-detachable manner, and the cup and nut can be pushed to place the grinding wheel 10 under compression.

The force required to place the grinding wheel 10 in compression is achieved by the connection between the spindle 14 and the threads 146 of the nut 134 . It should be noted with reference to FIG. 1 that when the grinding wheel is threaded onto the spindle 14, the surface 69 (which may be a suitable washer, spacer or part of the spindle) meets the upper surface 170 of the curved portion 162 of the side wall 152 in line contact. . Thus, due to this engagement, the cup experiences a downward force. At the same time, the interengagement between the spindle threads 14 and the nut threads 146 pushes the nut toward the side of the cup. Since the surface 172 of the flange 154 is in contact with the surface 174 of the supporting flange 128, the grinding wheel is in a compressed state by the force of the supporting flange and the back surface 18 of the grinding wheel 10, and the base assembly 60 and the gland 90 as above same narrative.

If desired, flange 128 and cup 150 may be integrally formed, as shown in FIG. 12 . Thus, the composite nut-flange can be stamped out of a single sheet metal with the required recessed area 180 to accommodate The raised portion 24 on the concave grinding wheel should be concave. From the mid-section of the body 182 may extend a side wall 184 of the cup, having an inwardly curved end 186 and forming the arch 188 described above. A reinforcing ring 190 may also be provided if desired.

Those who are familiar with the profession can understand that the grinding wheel assembly described above and in the accompanying drawings does not require adhesives during production, and the assembly is simple and easy; compared with the device using the casting hub in the prior art, its weight is lighter; The grinding wheel and the power tool are provided with fixtures which prevent rotation of the grinding wheel relative to the transmission parts by means of increased extrusion force. It has also been found that the above-described device made in accordance with the preferred embodiment operates very smoothly and without vibration. The reason for this is that all parts are precisely centered on each other, and the mating surfaces are parallel to each other when under pressure, vibrations can only be induced if the grinding wheel 10 is not precisely balanced during manufacture.

Said structure can be applied to the standard diameters of all currently known specifications, that is, concave grinding wheels of 4 inches, 4.5 inches, 5 inches, 7 inches and 9 inches. With the current die-cast integral hub-flange construction, only the 7-inch and 9-inch grinding wheels use the discarded hub, while the 4-inch, 4.5-inch and 5-inch grinding wheels use the traditional two-piece mounting device that is customary in the prior art mentioned above .

A disposable grinding wheel-transmission member assembly is disclosed above. The assembly securely holds the grinding wheel during operation, is lightweight, vibration-free, less expensive than prior art discarded grinding wheels, and complies with all existing and known safety standards.

Claims (30)

1, a kind of disposable polishing utensil, it comprises that has a front, the polishing member of the back side and first centre bore, disposable use drive disk assembly on threaded rotary main shaft that above-mentioned polishing utensil is fixed to power tool, described drive disk assembly has one and is placed on the above-mentioned polishing member back side, the support lugn of its second through hole and the above-mentioned first centre bore centering, and tapped hold-down nut with nut body, this nut body is contained in the above-mentioned centre bore, an and protruding flange on the one end, this flange is placed on the described front of above-mentioned polishing member, the invention is characterized in that above-mentioned drive disk assembly also has:

The fixture that comprises the described nut body other end, be used for described hold-down nut and described support lugn are installed in above-mentioned polishing member non-dismountablely, needn't use bonding agent, thereby in use when load is applied on the described polishing member, described hold-down nut and described support lugn can be shifted near mutually vertically, push above-mentioned polishing member between the flange of described support lugn and described hold-down nut, thereby got rid of between above-mentioned polishing member and the above-mentioned drive disk assembly rotation in use.

2, disposable use polishing utensil according to claim 1 is characterized in that described fixture comprises outwards outstanding device at least a portion of described second end of described nut body.

3, disposable use polishing utensil according to claim 2 is characterized in that the described part of described nut body includes one by being placed on the continuous loop on the described support lugn.

4, disposable use polishing utensil according to claim 3, described second end that it is characterized in that described nut body is by heading, to form described continuous loop.

5, disposable use polishing utensil according to claim 4, it is characterized in that described support lugn has an inner surface and an outer surface, wherein said inner surface is relative with the described back side of described polishing member, also has a periphery plane, the described back side of the described polishing member of this plane contact, the described outer surface of described support lugn has the rib apparatus that stretches out.

6, disposable use polishing utensil according to claim 5 is characterized in that described rib apparatus comprises the first and second continuous ribs.

7, according to each described disposable use polishing utensil in the claim 1 to 6, it is characterized in that described polishing member is a concave emery wheel.

8, disposable use polishing utensil according to claim 1, it is characterized in that also comprising the device that is placed between described support lugn and the described power tool, when described threaded main shaft pulls to described instrument to described hold-down nut by connecting thread, this device applies power to described support lugn, to realize above-mentioned pushing.

9, disposable use polishing utensil according to claim 8 is characterized in that the device that the described power of applying is used is installed on the described axle.

10, disposable use polishing utensil according to claim 9 is characterized in that the device of the described power of applying loosely is clamped on the described axle, and this device also includes an annulus that is screwed on the described axle, in order to clamp the device of the described power of applying.

11, disposable use polishing utensil according to claim 10, the device that it is characterized in that the described power of applying is a base plate, and one the 3rd centre bore is arranged on it, with described first and second holes centering vertically, also has the ridge device of configuration downwards, in order to contact described support lugn.

12, disposable use polishing utensil according to claim 11, it is characterized in that described base plate defines a cavity between the sub-assembly of described support lugn and nut and described base plate, in use, described second end of described nut can be drawn back in it.

13, disposable use polishing utensil according to claim 8, the device that it is characterized in that the described power of applying is by described support lugn support.

14, disposable use polishing utensil according to claim 13, the device that it is characterized in that the described power of applying is a lid, its part is on the throne by described support lugn clamping at least.

15, disposable use polishing utensil according to claim 14 is characterized in that described lid is made of metal, and loosely is fixed on the described support lugn.

16, disposable use polishing utensil according to claim 14 is characterized in that described lid is made of metal, and non-dismountable is fixed to described support lugn.

17, disposable use polishing utensil according to claim 5, it is characterized in that also comprising a base device, be fixed on the described threaded main shaft, when described polishing utensil is screwed onto on the described rotary main shaft, in order to engage with the outer surface of described support lugn.

18, disposable use polishing utensil according to claim 17, the described outer surface that it is characterized in that described support lugn is extended with rib apparatus, described base device includes a disk, this disk has a first surface that joins with described rib apparatus, also have a device, loosely be clamped on the described axle at following described disk of the situation that does not have described polishing utensil.

19, disposable use polishing utensil according to claim 18 is characterized in that described disk first surface forms continuous ridge device, joins with the mode of line contact and the rib apparatus on the described support lugn basically.

20, disposable use polishing utensil according to claim 19 is characterized in that describedly being used for loosely that the device of the described disk of clamping is an annulus that is made of plastics, and can be screwed on the described main shaft.

21, disposable use polishing utensil according to claim 18 it is characterized in that described rib apparatus comprises the first and second continuous ribs, and described disk comprises first and second ridges, and the mode with the line contact engages with described first and second ribs basically.

22, disposable use polishing utensil according to claim 17 is characterized in that described base device also comprises near the washer arrangement that is installed in the described axle of described power tool.

23, disposable use polishing utensil according to claim 22 is characterized in that described packing ring is to be made by the material that is different from described power tool.

24, disposable use polishing utensil according to claim 23 is characterized in that described material is plastics.

25, disposable use polishing utensil according to claim 24 is characterized in that described material is a kind of selflubricatingpiston.

26, disposable use polishing utensil according to claim 1 is characterized in that also including gland, a central through hole is arranged on it and described lid is fixed to device on the described support lugn.

27, disposable use polishing utensil according to claim 26 is characterized in that described fixture comprises clamping device.

28, disposable use polishing utensil according to claim 27 is characterized in that described gland also comprises a lid, and outstanding overskirt ends on the described clamping device under it.

29, disposable use polishing utensil according to claim 28, it is characterized in that described lid comprises first and second surfaces, when described gland was fixed on the described polishing utensil, its first surface and described power tool axle joined, and its second surface and described support lugn join.

30, disposable use polishing utensil according to claim 29, it is characterized in that described support lugn has an inner surface and an outer surface, the described outer surface of wherein said support lugn stretches out a continuous ribs, and described second surface engages with described ribs.

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