Patent Publication Number: US-2004053569-A1

Title: Buffing disc for cleaning hubs

Description:
BACKGROUND OF THE INVENTION  
       [0001] The present invention is related to a measure for servicing a car, and more particularly to a buffing disc for cleaning hubs.  
       [0002] There is no suitable tool for a serviceman to clean a hub. In general, a serviceman simply uses a sandpaper or grinding wheel to clean the surface of the hub. This can hardly achieve optimal working efficiency and effect.  
       SUMMARY OF THE INVENTION  
       [0003] It is therefore a primary object of the present invention to provide a buffing disc for cleaning hubs. The buffing disc is adapted to the hub so that the buffing efficiency and quality can be enhanced.  
       [0004] It is a further object of the present invention to provide the above buffing disc for cleaning hubs. The buffing disc includes a grinding body capable of fully buffing the hub. The grinding body is replaceable as necessary.  
       [0005] It is still a further object of the present invention to provide the above buffing disc for cleaning hubs, which is applicable to different types of hubs for achieving quickly buffing effect.  
       [0006] It is still a further object of the present invention to provide the above buffing disc for cleaning hubs, which is able to collect the waste impurities produced during buffing operation so as not to affect the buffing operation.  
       [0007] It is still a further object of the present invention to provide the above buffing disc for cleaning hubs, which is able to expel the waste impurities produced during buffing operation so as to keep a good buffing effect.  
       [0008] According to the above objects, the buffing disc for cleaning hubs includes a seat body and a grinding plate body. The seat body has a connecting end face with a predetermined area. A shaft chamber inward extends from a center of the connecting end face by a predetermined depth to form an opening on the connecting end face. The grinding body is disposed on the connecting end face around the opening of the shaft chamber.  
       [0009] The present invention can be best understood through the following description and accompanying drawings wherein: 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0010]FIG. 1 is a perspective assembled view of a first embodiment of the present invention;  
     [0011]FIG. 2 is a perspective exploded view of the first embodiment of the present invention;  
     [0012]FIG. 3 is a sectional view taken along line  3 - 3  of FIG. 1;  
     [0013]FIG. 4 is a perspective assembled view of a second embodiment of the present invention;  
     [0014]FIG. 5 is a perspective exploded view of the second embodiment of the present invention;  
     [0015]FIG. 6 is a sectional view taken along line  6 - 6  of FIG. 4; and  
     [0016]FIG. 7 is a sectional view of a third embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
     [0017] Please refer to FIGS.  1  to  3 . According to a first embodiment, the buffing disc  10  for cleaning hubs of the present invention is composed of a seat body  20 , a grinding body  30  and a pair of attachable plates  40 .  
     [0018] The seat body  20  is a hard bell-shaped body made of polymer material. The seat body  20  has a circular connecting end face  21 . An annular stop wall  22  outward extends from the circumference of the connecting end face  21  by a certain height. A shaft chamber  23  inward extends from the curvature center of the connecting end face  21  by a certain depth, whereby the center of the connecting end face  21  is formed with an opening  231  of the chamber. Multiple inclined grooves  24  are formed on the wall of the shaft chamber  23  and inward extend from the circumference of the opening  231 . The depths of the inclined grooves  24  are gradually reduced. Several ribs  25  are defined between the adjacent inclined grooves  24 . A transmission shaft  26  is fixedly disposed on the other end of the seat body  20  opposite to the connecting end face  21 . The transmission shaft  26  coaxially corresponds to the curvature center of the connecting end face  21 .  
     [0019] The grinding body  30  includes a hard annular substrate  31  and an annular buffing plate  32  having a certain thickness. One face of the buffing plate  32  is fixedly connected on a corresponding face of the substrate  31 . The buffing plate  32  has a buffing plane face  33  opposite to the substrate  31 . An annular buffing face  34  is formed on inner circumference of the buffing plate  32 . Four chip-expelling notches  35  are formed on the outer circumference of the buffing plate  32  at equal intervals.  
     [0020] The attachable plates  40  include a loop plate  41  and a hook plate  42  attachable to each other. The loop plate  41  and hook plate  42  are respectively fixedly attached to the connecting end face  21  and the face of the substrate  31  opposite to the buffing plate  32 .  
     [0021] By means of the attachable plates  40 , the grinding body  30  can be tightly connected with the seat body  20 . The substrate  31  is snugly inserted in a circular receiving space defined by the stop wall  22 , whereby the grinding body  30  is accurately and firmly connected with the seat body  20 . When suffering a great transverse external force, the attachable plates  40  are prevented from detaching from each other.  
     [0022] In use of the buffing disc  10 , by means of a general pneumatic tool or electric tool, via the transmission shaft  26 , the seat body  20  is rotated. Accordingly, the grinding body  30  can buff a hub.  
     [0023] The present invention has the following advantages:  
     [0024] 1. The shaft chamber  23  of the buffing disc  10  can snugly accommodate therein the projecting body of the hub. The buffing plane face  33  of the grinding body  30  can attach to the annular face of the hub and buff the face. At the same time, the annular buffing face  34  of the inner circumference of the buffing plate  32  surrounds the projecting body of the hub and buffs the circumference of the projecting body. Accordingly, the buffing disc  10  can quickly buff the hub.  
     [0025] 2. When buffing the hub with the buffing disc  10 , the produced waste impurities can be moved out from the contact faces of the buffing plate  32  and the hub in two manners. One is that the impurities are exhausted through the chip-expelling notches  35 . The other is that the impurities are moved through the central hole of the buffing plate  32  into the shaft chamber  23 . Under rotation of the seat body  20 , the centrifugal force will collect the waste impurities in the inclined grooves  24 . After the buffing operation is completed, the impurities are cleared off. Accordingly, the buffing disc  10  is able to perform the buffing operation with high quality.  
     [0026] 3. Via the attachable plates  40 , the grinding body  30  is replaceably connected with the seat body  20 . Therefore, when the buffing plate  32  is worn out and needs to replace, it is easy to renew the buffing plate  32 . During replacement, an operator&#39;s fingers can extend into the inclined grooves  24  to have a better force application point so as to conveniently remove the grinding body  30  from the seat body  20 .  
     [0027] 4. The inclined grooves  24  also help in reducing the weight of the seat body  20 .  
     [0028] 5. The ribs  25  serve to support the grinding body  30 , whereby during buffing operation, the grinding body  30  can fully attach to the buffed face.  
     [0029] FIGS.  4  to  6  show a second embodiment of the present invention, in which the buffing disc  10 ′ is substantially identical to the first embodiment. The second embodiment is different from the first embodiment in that the second embodiment is adapted to a hub with longer projecting length. In addition to the substrate  31 ′ and buffing plate  32 ′, the grinding body  30 ′ of the second embodiment further includes an annular pad body  36 ′ connected between the substrate  31 ′ and the connecting end face  21 ′ for elongating the length of the buffing disc  10 ′ to accommodate a longer hub. Two faces of the pad body  36 ′ are respectively connected with the connecting end face  21 ′ and the substrate  31 ′ by means of the attachable plates  40 ′.  
     [0030]FIG. 7 shows a third embodiment of the present invention, in which the seat body  20 ″ further includes a holder section  201 ″. One end of an extension sleeve  202 ″ with a certain length is engaged with the holder section  201 ″. A dome section  203 ″ is engaged with the other end of the sleeve  202 ″. Accordingly, in accordance with actual requirement, by means of the sleeve  202 ″, the depth of the shaft chamber  23 ″ of the seat body  20 ″ can be changed to meet the requirement.  
     [0031] The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention.