Abstract:
A mop system for cleanroom use incorporating an autoclavable mop head adapted for snap-on, pressure fit attachment to a frame member having a pair of substantially planar free end portions. The mop head incorporates raised profile insert elements engaging free end portions of the frame member. The mop head is also optionally adapted to retain a dusting cloth or other web structure in removable relation across its surface.

Description:
This application is a continuation of application Ser. No. 11/788,700, now U.S. Pat. No. 7,543,351, in the name of Nobile et al., filed Apr. 20, 2007, the contents of which are hereby incorporated by reference as if fully set forth herein. 
    
    
     TECHNICAL FIELD 
     This invention relates generally to mopping systems and more particularly to a mop system incorporating an autoclavable replaceable mop head adapted for pressure fit attachment to a substantially planar mop frame. The mop head is adapted to provide low levels of particle contamination and may be particularly suitable for use in cleanroom environments. 
     BACKGROUND OF THE INVENTION 
     Mopping systems incorporating replaceable sponge-based refills are generally known. By way of example, replaceable sponge-based mop heads are described in U.S. Pat. Nos. 4,216,562 to Strahs, 6,058,552 to Hanan and 6,148,465 to Hsieh et al., the teaching of all of which are incorporated herein by reference. As will be appreciated, prior mop constructions have typically relied on relatively complex clamping systems, solid surface attachment plates, and/or threaded attachment elements such as screws and the like in order to provide a desired operative connection between a replaceable refill and the handle structure. Each of these attachment systems has certain inherent limitations. By way of example, systems which utilize clamping engagement between a mop head and handle structure may require a relatively complex clamp structure which may tend to corrode or otherwise degrade over time in the presence of cleaning solutions. Likewise, mop systems which utilize screws and/or other threaded fasteners may be prone to premature failure at the point of mechanical connection. Systems which utilize foam refills backed by solid surface connection plates may rely on relatively complex attachment mechanisms for connection to mop frames. 
     SUMMARY OF THE INVENTION 
     The present invention provides advantages and/or alternatives over the prior art by providing a mop system incorporating an autoclavable mop head adapted for snap-on, pressure fit attachment to a frame member having a pair of substantially planar free end portions. 
     According to a potentially preferred feature, the mop head is also optionally adapted to retain a dusting cloth or other web structure in removable relation across its surface. 
     Other aspects and features of the invention will become apparent to those of skill in the art through reference to the following detailed description of exemplary embodiments and accompanying figures and/or through practice of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view of a mop system incorporating a replaceable foam body head in attached pressure fit relation to a frame supporting a handle connection; 
         FIG. 2  is an elevation view illustrating the top of the replaceable foam body head in attached pressure fit relation to a frame supporting a handle connection; 
         FIG. 3  is an end view of the replaceable foam body head in attached pressure fit relation to a frame supporting a handle connection; 
         FIG. 4  is an elevation view illustrating the top of the replaceable foam body head free of engagement with the frame; and 
         FIG. 5  is an end view of the replaceable foam body head taken generally along line  5 - 5  in  FIG. 4 . 
     
    
    
     While the invention has been illustrated and will hereinafter be described in connection with certain exemplary and potentially preferred embodiments, practices and procedures, it is to be understood that the invention is in no way limited to any such illustrated and described embodiments, practices or procedures. Rather, it is to be understood that it is the intention of the applicants to cover all alternatives and modifications and all equivalents thereto as may fall broadly within the trust spirit and scope of the inventive concepts herein. 
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     Reference will now be made to the drawings wherein to the extent possible like reference numerals are utilized to designate like elements throughout the various views. Referring to  FIG. 1 , an exemplary mop  10  is illustrated. As shown, the mop  10  includes a removable elongate handle  12  attached to a pivoting handle connection  14 . In the illustrated and potentially preferred configuration, the handle connection  14  is held in pivoting relation to a frame  15  ( FIG. 2 ) by a hairpin bracket structure  16 . According to the illustrated and potentially preferred configuration, the pivot connection and frame are preferably substantially as disclosed in U.S. Pat. No. 5,507,065 to McBride et al. the contents of which are incorporated herein by reference in their entirety. 
     Referring simultaneously to  FIGS. 1-3 , various features of the pivoting handle connection  14  will now be described. As shown, the handle connection  14  is preferably substantially tubular in construction incorporating a pair of outwardly projecting spring bias pin elements  24  adapted to engage aligned openings in the handle  12  when the handle is placed over the handle connection  14 . In the potentially preferred construction, the spring biased pin elements  24  are operatively connected to a biasing element in the form of a compressible U-shaped leaf spring disposed at the interior of the connection  14 . However, virtually any other suitable biasing structure may likewise be used if desired. 
     As noted previously, the handle connection  14  is preferably held in pivoting relation relative to the frame  15  by a hairpin bracket structure  16 . As best illustrated in  FIG. 3 , in the potentially preferred construction a bolt  28  extends through the “keyhole” at the base of the hairpin bracket structure  16 . A tensioning nut  30  secures the bolt  28  in place and may be tightened or loosened so as to adjust the force required to pivot the handle connection  14  in the manner as may be desired. As will be appreciated, the mounting arrangement between the handle connection  14  and the frame  15  permits the handle  12  to be pivoted to substantially any desired angle relative to the frame  15 . 
     As illustrated, the mop  10  includes a replaceable mop head  40  adapted for disposition in pressure fit attached relation to frame  15 . In this illustrated construction, the mop head  40  preferably includes a block of absorbent cellular foam  42  as will be well known to those of skill in the art with a layer of fabric  44  disposed in laminated relation across one side of the foam  42 . The block of absorbent cellular foam  42  is normally substantially planar. By “normally substantially planar” it is meant that the block does not have substantial inherent edge to edge curvature. 
     The fabric  44  is preferably a non-snagging knit polyester fabric although other fabrics may likewise be utilized if desired. The fabric  44  is preferably secured to the foam  42  by flame lamination although adhesives or other attachment techniques may likewise be utilized if desired. While it is contemplated that the fabric  44  may cover only the lower face of the foam, it is likewise contemplated that the fabric  44  may also cover the upper face of the foam and/or any or all of the vertical surfaces of the mop head  40  if desired. 
     As shown, the mop head  40  preferably incorporates a raised profile contoured attachment plate  46  across the upper face of the foam  42 . The attachment plate  46  may be fixed across the upper face of the foam by an adhesive disposed in a selective pattern between the attachment plate  46  and the upper face of the foam  42 . The attachment plate  46  is preferably constructed from a relatively light gauge moldable plastic formed to a desired shape by techniques such as thermo-forming, injection molding, blow molding or the like. 
     It is contemplated that the attachment plate  46  will incorporate a pattern of raised profile regions with underlying voids adapted to engage and retain frame  15  in pressure fit relation. The attachment plate  46  also incorporates depressed profile zones defining a base providing surfaces for attachment to the foam  42 . By way of example only, and not limitation,  FIGS. 2 ,  4  and  5  illustrate one contemplated configuration for the attachment plate  46  which is adapted to retain a frame  15  such as a wire frame having a central plate for connection to hairpin bracket structure  16  with a pair of substantially planar free end portions as illustrated and described in U.S. Pat. No. 5,507,065. In this configuration the attachment plate  46  includes raised profile insert structures  50  configured for pressure fit insertion through openings in the free end portions of frame  15 . 
     In the illustrated and potentially preferred configuration a substantially matched pair of raised profile insert structures  50  are utilized which substantially correspond in size and shape to the openings in the free end portions of frame  15 . However, it is likewise contemplated that other arrangements of raised profile insert structures may be used if desired. By way of example only, it is contemplated that an alternative arrangement may utilize multiple raised profile insert structures of smaller dimensions such as a row of squares or other shapes for insertion through free end portions of frame  15  in place of the illustrated single insert structures. 
     Regardless of the shape of the raised profile insert structures, it is contemplated that the raised profile insert structures are preferably substantially hollow so as to define voids between the upper surface of the foam  42  and the interior of the attachment plate  46 . Accordingly, the raised profile insert structures are slightly compressible when subjected to pressure. According to a potentially preferred practice, the raised profile insert structures incorporate a flared distal surface overlying a reduced diameter body portion  54  such that edges of the flared distal surface slightly overhang the reduced diameter body portion  54 . As shown, the edges of the flared distal surface are preferably slightly chamfered so as to facilitate sliding insertion through the frame  15 . As best illustrated in  FIGS. 3 and 5 , this arrangement permits perimeter wire elements of the frame member  15  to be pressed over the flared distal surface and to then nest with the reduced diameter body portion  54  with perimeter elements of frame  15  pressing into the sides of the insert structure. The compression force of frame  15  against the reduced diameter body portion  54  in combination with the overhanging edge of the flared distal surface thereby holds frame  15  in place until an adequate disengaging pulling force is applied by an operator. 
     As illustrated, the attachment plate  46  may also include an arrangement of raised profile reinforcement elements  52 . In the illustrated and potentially preferred configuration, substantially matched raised profile reinforcement elements  52  are disposed substantially along the length of the attachment plate  46  between the raised profile insert structures  50  and the outboard edges of the attachment plate  46 . Such reinforcement elements may aid in providing flexural rigidity to the mop head  40 . Of course, it is likewise contemplated that other arrangements of raised profile reinforcement elements may be used if desired. 
     While the mop  10  is fully functional in the condition as illustrated and described, it is contemplated that the mop head  40  may be adapted to facilitate the use of use of a removable dust cloth (not shown) such as a low weight woven or nonwoven sheet or the like as will be well known to those of skill in the art. As illustrated, in order to facilitate use of such a removable dust cloth, slits  60  may be applied in a predefined arrangement across raised profile surfaces of the attachment plate  46 . As will be appreciated, since such raised profile surfaces stand away from the upper surface of the foam  42 , cavities are present between the foam  42  and the slits  60 . Thus, the dust cloth may be wrapped around the mop head  40  and portions of the dust cloth may be pressed through the slits  60  and into the underlying cavities thereby holding the dust cloth in place around mop head  40  if desired. Of course, the slits  60  may be of virtually any shape as may be desired including the illustrated elongate configuration with angled legs, a straight slot configuration, a star shaped configuration with radially extending legs or the like. 
     It is to be understood that while the present invention has been illustrated and described in relation to potentially preferred embodiments, constructions and procedures, that such embodiments, constructions and procedures are illustrative only and that the invention is in no event to be limited thereto. Rather, it is contemplated that modifications and variations embodying the principles of the invention will no doubt occur to those with ordinary skill in the art. It is therefore contemplated and intended that the present invention shall extend to all such modifications and variations as may incorporate the broad principle of the invention within the true spirit and scope thereof.