Cleaning and liquid contact with solids – Apparatus – With movable means to cause fluid motion
Patent
1977-12-22
1980-01-08
Tudor, Harold
Cleaning and liquid contact with solids
Apparatus
With movable means to cause fluid motion
134 1, 366127, H04B 1300
Patent
active
041830113
ABSTRACT:
Improved ultrasonic cleaning of large surfaces is achieved by modifying conventional transducers of either the cylindrical or piston vibratile type so that the transducer vibratile element is brought in closer proximity to the surface being cleaned. For efficiently cleaning the wall surface of a circular water-filled tank, such as a toilet bowl, a ceramic disc operating in the planar resonant mode is provided with an acoustic transmission line comprising a solid annulus bonded to the periphery of the ceramic. The radial dimension of the annulus is equal to one-half wavelength of sound in the material at the frequency of operation. The annulus serves as an acoustic transmission line to extend the peripheral vibrating surface of the ceramic to a region closer to the wall of the tank. The transmission line also increases the radiating area of the transducer which achieves increased sonic power density in the vicinity of the wall surface. For a transducer having a piston type vibratile element, a plurality of rubber bristle-like tips surrounds the periphery of the transducer face and serve as spacers for keeping the transducer in close proximity to the surface of the structure being sonically cleaned while the transducer is moved over the surface. The rubber bristles also serve as a brush to wipe away the residue from the ultrasonically-cleaned surface.
REFERENCES:
patent: 2283285 (1942-05-01), Pohlman
patent: 2775434 (1956-12-01), Probst
patent: 3421939 (1969-01-01), Jacke
patent: 3660809 (1972-05-01), Pearson
patent: 3700937 (1972-10-01), Rissolo
patent: 3872533 (1975-03-01), Proffit
patent: 4064885 (1977-12-01), Dussault
Dellorfano, Jr. Fred M.
Massa Donald P.
Tudor Harold
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