referring now to the drawings wherein like reference numerals denote like elements throughout the several views , fig1 illustrates , in perspective , a preferred embodiment of the invention in accordance with the present application . the air guard diffuser is shown generally at 10 , mounted on the pad shroud 11 of the floor polishing machine 1 . the floor polishing machine 1 includes a housing 2 , electric motor compartment 3 , wheels 4 and handle 5 . the polishing machine depicted has a caster center support 6 as disclosed in u . s . pat . no . 4 , 365 , 377 . the castering feature permits the housing 2 to move independently of pad shroud 11 . the air guard diffuser 10 is affixed to the perimeter of pad shroud 11 . referring now to fig2 the expanded relationship of the components of diffuser 10 is shown . permeable element 12 is formed of a flexible , sponge - like material , such as scotch brite ® pad . permeable element 12 permits the passage of air ; because of its internal structure the path of the air is repeatedly deflected and thus the energy of the disturbed air is greatly dissipated before the air exits the element . the structure of element 12 is such that the material presents a solid wall capable of blocking any particulate matter which may attempt to pass through it . element 12 is formed of a narrow strip , approximately three inches wide , of a length sufficient to completely encircle the perimeter of pad shroud 11 , which is typically a length of about six feet . permeable element 12 is attached to mounting ring 13 by means of a small amount of velcro ® strips 14 , about five usually being sufficient . the velcro ® strips 14 have an abundance of small gripping protrusions which adhere readily to the inner surface of permeable element 12 . the strips 14 are typically one inch wide and measure six inches in length . the velcro ® strips are attached to the outer surface of mounting ring 13 by any convenient method , such as an adhesive tape or glue . once the velcro ® strips 14 are attached to mounting ring 13 , permeable element 12 can be pressed into place on each of the strips 14 . to complete the assembly of the diffuser 10 , retaining clip 15 is forced over element 12 . clip 15 contains a plurality of toothed apertures 16 which grip the material of element 12 . the diameter of clip 15 is selected such that a constant compresive force is exerted on the element 12 , thereby pressing element 12 against velcro ® strips 14 . the mounting of the air guard diffuser onto the floor polisher is best visualized by reference to fig1 and 3 . the mounting ring 13 is formed from a continuous strip of a flexible , lightweight material , such as aluminum . the ring 13 is typically about two inches wide and of a diameter sufficient to encircle pad shroud 11 . a series of holes 17 , typically 1 / 2 inch in diameter , are drilled along the center line of the ring 13 to permit the passage of air through the ring 13 and thus through element 12 . also formed into the inner surface of ring 13 are a number of grooves 18 which appear as ridges 19 when viewed from the outer surface of ring 13 . the spacing and shape of the grooves 18 are selected to be compatible with the surface contours of pad shroud 11 for the specific polishing machine 1 in use . in this particular embodiment of the invention , the spacing of ridges 19 creates a channel 20 within which the veclro ® strip 14 securing the permeable element 12 may be conveniently mounted . prior to mounting the air guard diffuser 10 on the pad shroud 11 , the veclro ® strips 14 should be inserted in channel 20 of the mounting ring 13 . the permeable element 12 can then be affixed to the strips 14 so as to encircle mounting ring 13 . clip 15 is then press fitted around the permeable element 12 such that toothed apertures 16 grip the permeable element 12 . the clip 15 thereby presses permeable element 12 against mounting ring 13 . the air guard diffuser 10 is thus completely assembled and ready for mounting to pad shroud 11 . in order to mount the air guard diffuser 10 , the polishing machine 1 is pivotally tilted by pressing downwardly on handle 5 such that the housing 11 is raised and its bottom surface is exposed . the air guard diffuser 10 is then placed beneath pad shroud 11 , and pad shroud 11 is lowered onto the diffuser 10 . by forcing the pad shroud 11 downwardly onto the diffuser 10 , mounting ring 13 is thereby forced onto the pad shroud 11 and is secured by the retaining grooves 18 . the polishing machine 1 may then be operated in its normal manner . as particulate matter is disturbed by the rotation of the polishing pads , the diffuser 10 physically blocks its exit from the pad shroud 11 . the air turbulence that is created during the machine &# 39 ; s operation is dissipated as the high velocity air passes through permeable element 12 . the permeable element 12 is composed of a relatively soft material which may safely contact the floor surface without causing marring or scratching of the floor . thus , during normal operation of machine 1 , the permeable element 12 is in continuous contact with the floor , thereby eleminating any path by which trubulent air may exit the housing 11 except through the permeable element 12 . similarly , the permeable element 12 physically intercepts any particulate matter disturbed by the motion of the polishing pad . numerous characteristics and advantages of my invention have been set forth in the foregoing detailed description . it will be understood , of course , that this disclosure is , in many respects only illustrative . changes may be made in detail , particularly in matters of shape , size and arrangement of parts without exceeding the scope of the invention . for example , permeable element 12 may be composed of many alternate materials including a non - permeable sponge which would be closed cell in nature and which would physically prevent all particulate matter , as well as turbulent air , from exiting the entire circumference of the polishing machine . the invention is not limited to using only a permeable element to diffuse the turbulent air ; a closed cell element 12 would effectively eliminate all air from being expelled . such an embodiment may be desirable in certain high filtration areas in which the polishing machines may be operated . the invention &# 39 ; s scope is defined in the language in which the appended claims are expressed .
an apparatus for diffusing air turbulence created during the normal operation of a rotary pad floor polishing machine . this device includes an air permeable member which surrounds the circumference of the pad shroud , thereby physically preventing the escape of particulate matter from beneath the floor polishing machine and disrupting turbulent air flow . a mounting ring is included for pressure fitting the permeable element to the pad shroud .