Patent Publication Number: US-11396085-B2

Title: Adapter for coupling abrasive elements to a floor finishing machine

Description:
CROSS-REFERENCED TO RELATED APPLICATIONS 
     Not applicable 
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not applicable 
     BACKGROUND OF THE INVENTION 
     I. Field of the Invention 
     The present invention relates generally to motor driven machines for grinding and polishing concrete or stone floors and, more particularly, to devices for mating abrasive elements to a variety of existing floor finishing machines in the field. 
     II. Discussion of the Prior Art 
     As is described in U.S. Pat. No. 5,605,493 to Donatelli, motor driven machines for grinding, polishing and buffing concrete, terrazzo and other stone floors generally comprise a motor driven driver disc on the underside of which are removably attached one or more plates or pads having abrasive members on their underside for engaging the floor surface. Applicant&#39;s published U.S. application 2015/0245759A1 describes the construction of an abrasive pad and its mode of attachment to a driver disc. The pad  16  is designed to mate with a driver disc having a specific key-hole/pocket arrangement. 
     Applicant corporation is in the business of providing diamond abrasive pads for use on floor finishing equipment and, because different manufacturers of floor finishing machines have not standardized on a single mode of replaceably attaching abrasive pads to machine driver plates, a need exists for a simple, inexpensive mode of adapting applicant&#39;s abrasive pads to a variety of different driver plates that may be encountered on existing floor finishing machines in the field. The present invention meets this need. 
     SUMMARY OF THE INVENTION 
     The present invention relates to apparatus for removably affixing floor finishing abrasives to a drive plate of a floor finishing machine. An abrasive attachment plate having at least one abrasive element affixed to a first major surface thereof has a protuberance of a predetermined shape configuration projecting outward from a second major surface thereof. Completing the invention is an adapter clip having an interior aperture for mating with the predetermined shape of the protuberance and an exterior shape adapted to mate with a shape of a recess on the drive plate of the floor finishing machine. 
     A variety of such clips are produced having an interior aperture matching the shape of the protuberance employed on the attachment plate and having an exterior shape that mates to the variety of attachment grooves on the drive plates of machines offered by different manufacturers. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing features, objects and advantages of the present invention will become apparent to those skilled in the art from the following detailed description of a preferred embodiment, especially when considered in conjunction with the accompanying drawings in which: 
         FIG. 1A  is a perspective bottom view of an abrasive attachment plate; 
         FIG. 1B  is a perspective top view thereof; 
         FIG. 2A  is an abrasive attachment plate of a different (circular) shape; 
         FIG. 2B  is a perspective top view thereof; 
         FIG. 3  is a perspective view of an adapter clip in accordance with the present invention; 
         FIG. 4  is a top view thereof; 
         FIG. 5  is a cross-sectional view taken along the line  5 - 5  in  FIG. 4 ; 
         FIG. 6A  is a perspective view of a drive plate for a floor finishing machine; 
         FIG. 6B  is a bottom view of the drive plate of  FIG. 6A ; and 
         FIG. 7  is a perspective view of an alternative clip embodiment. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     This description of the preferred embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description of this invention. In the description, relative terms such as “lower”, “upper”, “horizontal”, “vertical”, “above”, “below”, “up”, “down”, “top” and “bottom” as well as derivatives thereof (e.g., “horizontally”, “downwardly”, “upwardly”, etc.) should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the apparatus be constructed or operated in a particular orientation. Terms such as “connected”, “connecting”, “attached”, “attaching”, “join” and “joining” are used interchangeably and refer to one structure or surface being secured to another structure or surface or integrally fabricated in one piece, unless expressively described otherwise. 
       FIGS. 1A, 1B, 2A and 2B  illustrate representative abrasive attachment plates for use on either riding or walk-behind floor finishing machines. The bottom views of  FIGS. 1A and 2A  show diamond abrasive members  10  bonded to the undersurface  12  of attachment plates  14 . The upper surface  16  includes an exemplary protuberance  18  having a predetermined shape configuration projecting outward from the plate surface  16 . The predetermined shape of the protuberance shown is bilaterally symmetrical about its longitudinal axis and exhibits a somewhat hourglass shape, but this shape is somewhat arbitrary as far as the invention is concerned. 
     Shown in  FIG. 3  is a perspective view of an adapter clip  20  having an interior aperture  22  specifically shaped to mate with the predetermined arbitrary shape of a protuberance  18  on the upper surface  16  of the attachment plate. The interior aperture of the adapter clip shown in the drawings is also bilaterally symmetrical about a central axis and the exterior shape is beveled along the length dimension thereof. 
     The adapter clip  20  is preferably fabricated from, a resilient material either a metal or a suitable high-temperature plastic such as Vespel® or Torlon® when it is recognized that the attachment plate  14  and the protuberance  18  become quite hot due to the friction when the abrasive bars  10  are made to abrade the cement or stone flooring during use of the floor finishing machine. Vespel plastic is a non-melting polyimide that can withstand repeated heating up to 300° C. without altering its thermal or mechanical properties. Torlon is another high temperature plastic that can serve as an effective alternative to metal in high temperature friction and wear applications. The plastic employed will preferably have a temperature in excess of 390° F. without becoming distorted. It is to be understood that the material of the clip need not need limited to metal or plastic, but can be of any material meeting the performance needs. 
     As can best be seen in  FIG. 4 , the exterior profile of the clip  20  is somewhat wedge-shaped having first and second ends  24  and  26  of radii R 1  and R 2 , respectively, where R 1  is greater than R 2 . As seen in the cross-sectional view of  FIG. 5 , the sides of the clip  28  and  30  are also beveled so as to slope slightly downward and inward from a top surface  32  of the adapter clip  20 . 
     A central longitudinal slot  34  through its thickness dimension extends from the end  24  of radius R 1  to the interior aperture  22 . This allows the aperture  22  of the clip to be expanded to fit the protuberance within the aperture  22  and allows the clip  20  to snap onto a protuberance  18  and become releasably clamped thereon due to the resiliency of the material from which the adapter clip  20  is made. 
       FIG. 6A  represents a perspective view of a drive plate for a floor finishing machine and is indicated generally by numeral  36 . It includes a central socket  38  adapted to fit onto a shaft of a motor or to an auxiliary shaft driven by a motor to thereby spin the disc. 
       FIG. 6B  is a bottom view of the drive plate  36  and is seen to include a plurality of grooves whose shape is adapted to mate with the exterior shape of the adapter clip  20 . Now, when the adapter clip is fitted onto the protuberance  18  of the attachment plate  14  and the end  26  of the adapter clip is fitted into the wider end of the groove  40  of the machine&#39;s drive plate  36  and pushed radially outward, the clip becomes locked in the groove  40  to retain the attachment plate onto the driven drive plate. It is to be understood that the adapter clip may have any number of different external shapes to conform to recess shapes on a variety of existing floor finishing machine drive plates being manufactured and sold and is not to be limited to that shown in  FIG. 4  hereof. 
       FIG. 7  is a perspective view of an alternative clip configuration  42  assembled onto a protuberance  18  of an abrasive plate  12  like that shown in  FIG. 2B . Again, the interior aperture of the clip  42  is downwardly and inwardly beveled so as to conform to the shape of the protuberance  18  when positioned as shown in  FIG. 7  and its exterior shape is again wedge-shaped and designed to fit into and be removably retained within a recess, like recess  40  on a floor machine&#39;s drive plate  36  shown in  FIG. 6B . 
     This invention has been described herein in considerable detail in order to comply with the patent statutes and to provide those skilled in the art with the information needed to apply the novel principles and to construct and use embodiments of the example as required. However, it is to be understood that the invention can be carried out by specifically different devices and that various modifications can be accomplished without departing from the scope of the invention itself.