Patent Publication Number: US-4368627-A

Title: Mat or rug cleaning system

Description:
This is a division of application Ser. No. 879,042, filed Feb. 21, 1978, entitled &#34;Mat Or Rug Cleaning Process Using Roller Brush&#34; being issued Oct. 7, 1980 as U.S. Pat. No. 4,226,641. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to cleaning machines and more particularly relates to machines for cleaning rugs, mats, and like objects having large surface areas, but being substantially flat and of a flexible nature and the term rug or &#34;mat&#34; is considered herein to include the other, unless otherwise noted. 
     The present invention relates to cleaning machines and more particularly relates to machines for cleaning rugs, mats, and like objects having large surface areas, but being substantially flat and of a flexible nature. 
     Even more particularly, the present invention relates to a rug or mat cleaning machine which utilizes a plurality of successive rollers having differential surface speeds thereby creating tucks or creases in the rug to expose the embedded dirt for easy removal by brushes which also form the alternating rollers. 
     2. General Background and Prior Art 
     In the cleaning of rugs and mats, such as commercial type mats which are seen in use at the entrance area to large office buildings, in elevators and the like, there is generally provided a washing vessel to which the rugs are added where they can be cleansed much in the manner as a conventional washing machine operates. 
     However, mats which have a fiber-like surface can easily trap dirt particles deep within even though their overall thickness may be relatively small. The dirt and like particles which are so embedded are difficult to remove. Some prior art devices have attempted to solve the problem of removing dirt and like matter from rugs or mats or similar items which become by the nature of their use quite dirty. 
     The following table provides a listing of some prior art devices which have been patented: 
     
         ______________________________________                                    
Prior Art Patents                                                         
Patentee(s)  U.S. Pat. Nos.                                               
                           Issue Date                                     
______________________________________                                    
H. W. Strassoefer                                                         
               821,764     May 29, 1906                                   
S. Chase, IV 2,067,752     August 18, 1934                                
B. R. Andrews                                                             
             2,276,605     March 17, 1942                                 
C. Mendelson 2,283,011     May 12, 1942                                   
Rodman I. Gregg                                                           
             3,747,375     July 24, 1973                                  
Rodman I. Gregg                                                           
             3,864,079     February 4, 1975                               
______________________________________                                    
 
    
     General Discussion of the Present Invention 
     The present invention solves the prior art problems and short comings in a simple and inexpensive manner. The present invention provides a cleaning apparatus which is comprised of a plurality of rollers which convey the rug or mat to be cleaned through a cycle which first beats the mat, then washes the mat and thereafter rinses it, and then squeezes the mat to remove extraneous water. In the preferred embodiment there is provided a plurality of feed rollers which grip the mat and convey it at a slower velocity throughout its trip through the machine. Alternating between these feed rollers is a plurality of brush rollers which have a surface velocity substantially higher than the surface velocity of the feed rollers. Thus, a slipping effect is produced between the surface of the brush rollers and the conveying rollers. This slipping effect urges the rug into a tuck or creased position when the rug passes from a brush roller to a feed roller. This differential speed and urging effect creates a crease or bunching up of the rug, the crease or bunching up of the rug preferably occurring in the mat which contains the dirt retaining fiber. Thus, the fiber is flexed to expose the dirt therewithin. At the time the crease exposes the dirt, the crease and dirt are being beaten and cleansed by the roller brushes which are proximately located thereto and are positioned in the washing water. This combination provides an improved cleaning effect which effectively and efficiently cleanses the dirty mats. 
     In addition pressure belts preferrably are included located above the cleaning brushes to enhance the cleaning action, and, the over-all operation of the machine. The preferred embodiment also includes a special beater roller with projecting axial ridges for initially beating out dust and lint. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     For a further understanding of the nature and objects of the present invention, reference should be had to the following detailed description, taken in conjunction with the accompanying drawings, in which like parts are given like reference numerals and wherein: 
     FIG. 1 is a perspective view of the preferred embodiment of the present invention with part of the near wall thereof partially cut away to show some of the internal components; 
     FIG. 2 is a side, close-up of one of the roller brush sections of the embodiment in FIG. 1; 
     FIG. 3 is a side schematic view of the rotating elements and sections of the embodiment of FIG. 1; while 
     FIGS. 4 and 5 are likewise side schematic views of selected ones of the roller elements and sections of the embodiment of FIG. 1, showing the two different drive systems for the rotating elements; and 
     FIGS. 6 and 7 are front and rear views, respectively, of the embodiment of FIG. 1. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIGS. 1-7 show the preferred embodiment of the apparatus 10 of the present invention. In FIGS. 1 &amp; 3 there can be seen an overall frame 12 which provides a liquid containing wash and scrubbing section 14 and a rinse section 16. 
     A conveyance section is designated generally by the numeral 20. Conveyance section 20 is comprised generally of a plurality of rollers 31-46. With reference to FIGS. 1 &amp; 3, the rollers 31-41 are driven, while rollers 42-46 are idler-type rollers having no direct driven power. 
     The rollers 31-46 shown in FIGS. 1 &amp; 3 are cooperatively arranged to convey a rug 50 through the path shown in FIG. 1. It should be noted in FIG. 1 that a rug will follow a path which produces a tuck designated by the numeral 52 at the points shown in the drawing. The tuck (not FIG. 2) so produced flexes the rug 50 to expose the nap fibers more fully to the cleansing action of the brush rollers 33, 35, 37, and 39. The tuck is produced by the differing speeds of the rollers which will be more fully discussed hereinafter. 
     Rug 50 begins its trip through the cleaning apparatus 10 of the present invention where it is sandwiched between rollers 31, 46. The indication of rotary travel of rollers 31, 46 is seen in the drawings, with only roller 31 being driven, roller 46 being an idler-type roller which is in surface connection with roller 31 and thus rotates therewith. The surface to surface contact of rollers 31, 46 also produces a non-slip driving means which will urge rug 50 forward at a substantially constant linear speed as is desireable. The speed of rollers 31, 46 will be preset and will urge rug 50 forward at a desired speed which can be varied depending on the type of mat 50 being cleaned, the dirt or like undesireable matter content, and like conditions. 
     A second set of rollers forming a dry beating section 13 for removing lint and dust is comprised of a beater 32 and a brush roller 33. Both beater 32 and brush 33 have a substantially higher surface speed at their peripheries than rollers 31, 46. However, they are not in face to face contact with one another, but are independently directly driven. Note in FIGS. 1 &amp; 3, the direction of rotation of rollers 32, 33 as is indicated by the curved arrows. Roller 32 is equipped with a plurality of axial, projecting ridges or arms 60 (note FIG. 1) which sequentially hit or abut the upper surface of rug 50, thereby beating out or agitating loose dirt or like undesireable particles contained within the fiber of rug 50. The combination of this beater 32 with brush 33 acts to remove initially particles of dirt from rug 50 while it is still dry. Note that brush roller 33 is provided with a brushing surface which removes the dirt material from the surface of rug 50, which removal is substantially enhanced by the operation of beater 32. 
     After leaving rollers 32, 33, rug 50 enters wash section 14. Wash section 14 can be filled with any desireable cleaning solution, such as water with a suitable commercial detergent or like cleaner. If desired, the liquid within wash section 14 can be heated to enhance its cleaning properties. However, it is noted that the mechanical cleaning action of the apparatus 10 is so effective that heated water is seldom needed, and hence the present invention serves to conserve energy. 
     Within wash section 14 there is a first set of conveying rollers 34, 45. Rollers 34, 45 are in close proximity to one another with roller 34 being driven while roller 45 is not independently drive, but rotates in surface to surface contact with roller 34. Roller 45 is thus of an idler nature. However, the close surface to surface abutment of rollers 34, 45 produces a non-slip situation which positively conveys rug 50 forward. This is unlike the contact of rug 50 with the previous rollers 32, 33 which are at a higher rate of speed at their peripheries than the surface of rug 50. Thus, rollers 32, 33 brush against and slip past the surface of rug 50 since its speed through the apparatus 10 is controlled by rollers 31, 46 and rollers 34, 45. 
     In a like manner, brush roller 35 slips past and abuts against rug 50 as it is at a higher rate of speed and at its periphery than the linear speed of rug 50 as it travels through the apparatus 10. A tuck 52 is produced when the rug travels between brush roller 35 and conveying rollers 36, 44. This tuck is produced by the differing peripheral speeds of rollers 36, 44 which is substantially slower than the peripheral speed of brush 35. The high speed of roller 35 tends to urge rug 50 forward and crowd it about the periphery of drive roller 36 thereby creating a tuck 52 in rug 50. This tuck or bunching up of the rug (note FIG. 2) exposes the fibers of the rug 50 thereby enhancing the removal of dirt therefrom. 
     Similar to the operation of rollers 31, 46 and rollers 34, 45, rollers 36, 44 are conveying rollers which abut one another in a surface to surface arrangement and thereby control the forward linear speed of rug 50, it being substantially equal to the peripheral speed of rollers 36, 44. In the preferred embodiment, roller 36 is driven, and roller 44 abuts roller 36 in a surface to surface engagement therewith, acting as an idler. 
     In the preferred embodiment, brush roller 37 acts in combination with conveying roller 38, 43 as was the case with the previous brush roller 35 and the previous conveying rollers 36, 44. This second set of brush rollers in combination with conveying rollers moving at a slower speed produces a second tuck 52 as can be seen from an inspection of FIGS. 1 &amp; 3. This tuck produces a second point where the fibers of rug 50 are flared open and exposed to enhance the removal of dirt as is desireable. In a like manner, conveying rollers 38, 43 are in a surface to surface engagement so that rug 50 will be conveyed therethrough in a positive non-slip manner. As was the case with the previous brush rollers, brush roller 37 rotates at a higher rate of speed and has a higher peripheral speed than the speed of rug 50 as it moves through the apparatus 10. A final tuck 52 is provided in the rinse section 16. In that section there can be seen brush roller 39 which is rotated at a substantially higher rate of speed than feed roller 40, 41, and 42. Rollers 41, 42 are in a face to face, surface to surface abutting relationship, with the roller 41 being driven and roller 42 being an idler type roller. Roller 42, which forms a wringer section 15, can be of a substantial weight to press against and abut roller 41 with some force so as to squeeze rug 50 therebetween and remove excess water therefrom. The roller 42 includes an outer foam rubber layer 42&#39; of for example half inch in thickness to provide a better friction surface. 
     As illustrated in FIG. 1, a series of upper interdititating belts 47 are provided between the rollers 40-43, 43-44 and 44-45 which press down on the rug 50 against the lower brushes (note direction arrow 48 in FIG. 2), which further enhance the cleaning action of the machine 10. It is further noted that if a rug or mat 50 would get hung up, the upper belts 47 would cause it to merely be run back over the brushes again. 
     It is noted that exemplary dimensions for the machine 10 and its elements are shown in FIGS. 3 and 4-6 with FIG. 3-7 drawn to scale. Exemplary rotational speeds for the roller elements are approximately twenty-three or twenty-four rpm for the restraining rollers 31, 34, 36, 38 40 and 41; approximately three hundred and eighty rpm for the brushes 33, 35, 37 and 39; and approximately seven hundred rpm for the beater brush 32, it being noted that the four beater elements 60 of beater brush would all hit the rug 50 within about an inch or less of travel of the rug. 
     As best illustrated in FIG. 3, the wall 16a is lower than wall 16b of the rinse section 16 which receives a flow of liquid into it, and when the flow of fluid into it creates an overflow, the overflow provides a source of additional wash water into the wash section 14 which is maintained at a lower fluid level (note wavy lines &#34;W.L.&#34; indicating the relative water levels). Appropriate drains and fluid inlet lines (generally not illustrated) are included for the wash and rinse sections 14, 16. 
     Because many varying and different embodiments may be within the scope of the inventive concept herein taught, and because many modifications may be made in the embodiments herein detailed in accordance with the descriptive requirements of the law, it is to be understood that the details herein are to be interpreted as illustrative and not in a limiting sense.