Filter system for mobile debris collection machine
First Claim
1. A mobile debris collection machine having an improved filter system including a chassis, a debris collection pickup on said chassis, a debris container on said chassis, a vacuum system for carrying dust and debris from said pickup to said container,said vacuum system including a housing associated with said container and having a dust and debris inlet opening therein above said container, an outlet in said housing, a vacuum fan for creating an air stream that moves dust and debris into said housing and moves dust out of said housing, and a filter system for removing dust from said air stream and depositing debris into said container, said filter system including a first filter stage having a rotating filter element that separates debris from said air stream and is located upstream of said vacuum fan, a second filter stage that is located downstream of said vacuum fan, and a third filter stage downstream of said second filter stage and positioned outside of said housing.
4 Assignments
0 Petitions
Accused Products
Abstract
A mobile debris collection machine which has an improved filter system includes a chassis, wheels for supporting the chassis, an operator controlled debris pickup on the chassis and a debris container on the chassis. There is a vacuum system for carrying debris from the pickup to the container, with the vacuum system including a vacuum fan located above the debris container for creating an air stream that moves dust and debris from the pickup toward the container. A filter system for removing dust and debris from the airstream includes a first filter stage formed of a rotating perforated member, a second filter stage that is located downstream of the vacuum fan and includes a mesh filter bag, and a third filter stage, located downstream from the second filter stage and including a pleated panel filter.
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Citations
16 Claims
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1. A mobile debris collection machine having an improved filter system including a chassis, a debris collection pickup on said chassis, a debris container on said chassis, a vacuum system for carrying dust and debris from said pickup to said container,
said vacuum system including a housing associated with said container and having a dust and debris inlet opening therein above said container, an outlet in said housing, a vacuum fan for creating an air stream that moves dust and debris into said housing and moves dust out of said housing, and a filter system for removing dust from said air stream and depositing debris into said container, said filter system including a first filter stage having a rotating filter element that separates debris from said air stream and is located upstream of said vacuum fan, a second filter stage that is located downstream of said vacuum fan, and a third filter stage downstream of said second filter stage and positioned outside of said housing.
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11. A mobile debris collection machine having an improved filter system including a chassis, a debris pickup on said chassis, a debris container on said chassis, a vacuum system for carrying dust and debris from said pickup to said container,
said vacuum system including a housing associated with said container and having a dust and debris inlet opening therein, an outlet in said housing, a vacuum fan for creating an air stream that moves dust and debris into said housing and moves dust out of said housing, a filter system for removing dust from said air stream and depositing debris into said container, said filter system including a first filter stage formed of a rotating filter element driven by said vacuum fan, a second filter stage, located downstream of said vacuum fan, and a third filter stage, located downstream of said second filter stage.
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14. A mobile debris collection machine having an improved filter system including a chassis, a debris collection pickup on said chassis, a debris container on said chassis, a vacuum system for carrying dust and debris from said pickup to said container,
said vacuum system including a housing associated with said container and having a dust and debris inlet opening therein above said container, an outlet in said housing, a vacuum fan for creating an air stream that moves dust and debris into said housing and moves dust out of said housing, a filter system for removing dust from said air stream and depositing debris into said container, said filter system including multiple filter stages downstream of said debris container allowing air to exit the machine after passing through all of the multiple filter stages during a normal operation condition, and a bypass door allowing air to exit the machine after passing through at least one but not all of the multiple filter stages during a bypass condition.
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15. A method of collecting debris with a machine including the steps of:
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providing a chassis, a debris container on said chassis, and a vacuum system for carrying dust and debris to said container, wherein said vacuum system comprises a vacuum fan;
operating the vacuum fan to create an air stream that moves dust and debris into said container and moves dust out of said container;
providing a filter system including multiple filter stages downstream of said debris container;
removing dust from said air stream and depositing debris into said container;
allowing air to exit the machine after passing through all of the multiple filter stages during a normal operation condition; and
allowing air to exit the machine though a bypass door after passing through at least one but not all of the multiple filter stages during a bypass condition.
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16. A method of debris collection with a mobile machine, including the steps of:
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providing a chassis, a debris container on said chassis, a debris collection pickup on said chassis, and a vacuum system for carrying dust and debris from said pickup to said container, said vacuum system including a vacuum fan;
operating the vacuum fan to create an air stream that moves dust and debris into said container and moves dust out of said container;
providing a filter system including a first filter stage having a rotatable filter element proximate to the container, and a second filter stage located downstream of said vacuum fan;
removing dust and debris from said air stream and depositing debris into said container; and
rotating the rotatable filter element to separate debris from the air stream prior to the second filter stage.
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Specification