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Ultrasonic cleaning method and apparatus
| Details |
Inventors: Browning, Iben;
Assignee:
Primary Examiner: Stinson; Frankie L.
Assistant Examiner:
Attorney, Agent or Firm: Kokjer, Kircher, Bradley, Wharton, Bowman & Johnson
The subject matter of the invention described herein is a cleaning device employing both ultrasonic and heat cleaning techniques and a method of cleaning an object utilizing techniques possible with the apparatus of the invention. The cleaning device includes a housing which receives a container for holding the object to be cleaned as well as a cleaning media. The housing defines a well which receives the container and the well is filled with water to partially surround the container. Heating elements raise the temperature of the cleaning media to at least 65.degree. C. Independent means generate ultrasonic waves which are transmitted through the container wall to the object being cleaned. Sequential timing means first operates the ultrasonic wave generating means followed by the heating means. In this manner, particulate matter may be removed from the object to be cleaned by the ultrasonic waves including pulsating currents which are induced by the ultrasonic waves. The object is then pasteurized using heat without baking foreign particulate matter onto the object. The currents set up by the ultrasonic waves will also cause circulation within the container and appropriate filter means is utilized in the path of the currents to filter out foreign particulate matter. The method includes the steps of subjecting a cleaning media holding an object to be cleaned to ultrasonic waves over a period of time sufficient to loosen and remove solid material together with circulating cleaning media and filtering the circulating media to filter out loosed particles followed by heating of the cleaning media to pasteurization temperature. |
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DETAILED DESCRIPTION I claim: 1.
A cleaning device for use with an aqueous cleaning media in cleaning objects placed in the media, said device comprising: a housing adapted to receive a container for holding said cleaning media and an object to be cleaned; means in said housing for heating said cleaning media to a temperature of at least 65.
degree.
C.
; means in said housing for sensing the temperature of said media in said container, said temperature sensing means being coupled with said heating means; means in said housing for generating ultrasonic waves in said media; and timing means coupled with both said ultrasonic wave generating means and said heating means and operable to provide sequential activation of said wave generating means and said heating means, the activation of said heating means following the activation of said wave generating means.
2.
The invention of claim 1, wherein said housing is adapted to hold a quantity of water sufficient to surround a portion of said container.
3.
The invention of claim 2, wherein said heating means is characterized by an ability to heat said media in said container to a temperature of a least 65.
degree.
C.
for at least 30 minutes.
4.
The invention of claim 2, wherein said ultrasonic wave generating means is characterized by an ability to generate waves of about 30 to 100 kHz.
5.
The invention of claim 4, wherein said heating means is characterized by an ability to heat said media in said container to a temperature of at least 65.
degree.
C.
for at least 30 minutes.
6.
The invention of claim 5, wherein said device includes means for sensing the temperature of said media in said container, said temperature sensing means being coupled with said heating means and providing a signal for controlling operation of said heating means.
7.
A device for cleaning objects in an aqueous cleaning media, said device comprising: a housing; a container adapted to receive said object and an aqueous cleaning media, said container being further adapted to be received by said housing; said housing being adapted to receive a quantity of water for partially surrounding said container; means in said housing for heating said cleaning media to a temperature of at least 65
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