Wearer comfort backpack vacuum

1. A wearer comfort backpack vacuum, comprising:

a vacuum body including a cannister portion and an adjacent motor compartment, the cannister portion having an initially open interior defined by surrounding sidewalls and an opening to the open interior;

a harness for supporting the vacuum body on a wearer's back;

a cover for the top opening of the cannister portion of the body;

a vacuum hose communicating with the cannister interior;

a vacuum motor located within the motor compartment arranged for pulling air and debris from a surrounding location, through the vacuum hose, in a primary air flow path through the interior of the cannister portion, and out an exhaust outlet to be exhausted back to the surrounding location;

at least one filter element disposed within the initially open interior of the cannister portion of the body;

a special air flow opening in the surrounding sidewalls of the cannister portion of the vacuum body which defines a secondary air flow path through the cannister interior secondary and in addition to the primary air flow path;

whereby air drawn into the interior of the cannister portion of the vacuum body through the secondary air flow path creates a cooling air movement adjacent the wearer's back by drawing atmospheric air from outside the cannister portion of the vacuum body into the interior of the cannister body when the vacuum body is supported on the wearer's back by the harness; and

wherein the special air flow opening in the surrounding sidewalls of the cannister portion of the vacuum body has associated therewith an air flow restrictor element which is selectively openable and closeable to restrict the amount of atmospheric air drawn from outside the cannister portion of the vacuum body into the cannister interior through the secondary air flow path.

2. The wearer comfort backpack vacuum of claim 1 , wherein the special air flow opening in the surrounding sidewalls of the cannister portion of the vacuum body is covered with a moveable plate, the plate having an air opening therein which is alignable in a first open position with the opening in the surrounding sidewalls of the cannister to permit the flow of air through the secondary air flow path into the cannister interior and which is moveable to a secondary closed position which closes off the secondary air flow path.

3. The wearer comfort backpack vacuum of claim 2 , wherein the plate can be moved to one or more intermediate positions between the open and closed positions.

4. The wearer comfort backpack vacuum of claim 3 , wherein the vacuum hose terminates outwardly in a vacuum nozzle which is used to contact a surface to be cleaned, and wherein adjustment of the plate with respect to the opening in the surrounding sidewalls of the cannister can be used as a vacuum brake/suction relief to reduce the degree of suction on the surface being cleaned when desired.

5. The wearer comfort backpack of claim 1 , wherein the at least one filter element located in the cannister interior includes one or more removable filter media and wherein the exhaust outlet also has an exhaust filter element associated therewith, the secondary air flow path defined by the opening in the cannister sidewalls passing through the removable filter media and through the exhaust filter element before being exhausted through the exhaust outlet.

6. A wearer comfort backpack vacuum, comprising:

a vacuum body including an upper cannister portion and a depending lower motor compartment, the cannister portion having an initially open interior defined by surrounding sidewalls and a top opening;

a harness for supporting the vacuum body on a wearer's back;

a cover for the top opening of the cannister portion of the body;

a vacuum hose communicating with the cannister interior through an inlet opening provided in the cover;

an electric vacuum motor located within the lower motor compartment arranged for pulling air and debris from a surrounding location, through the inlet opening, through a generally vertical primary air flow path through the interior of the cannister portion, and out an exhaust outlet to be exhausted back to the surrounding location;

one or more removable filter media disposed within the initially open interior of the cannister portion of the body;

a special air flow opening in the surrounding sidewalls of the upper cannister portion of the vacuum body above the motor compartment which defines a secondary air flow path through the cannister interior secondary and in addition to the primary air flow path;

whereby air drawn into the interior of the cannister portion of the vacuum body through the secondary air flow path creates a cooling air movement in the air space between the vacuum body and the wearer's back by drawing atmospheric air from outside the cannister portion of the vacuum body into the interior of the cannister body when the vacuum body is supported on the wearer's back by the harness;

wherein the special air flow opening in the surrounding sidewalls of the upper cannister portion of the vacuum body is covered with a moveable plate, the plate having an air opening therein which is alignable in a first open position with the opening in the surrounding sidewalls of the cannister to permit the flow of air through the secondary air flow path into the cannister interior and which is moveable to a secondary closed position which closes off the secondary air flow path to restrict the amount of atmospheric air drawn into the cannister interior from the outside the cannister portion of the vacuum body into the cannister interior through the secondary air flow path; and

wherein the plate can be moved to one or more intermediate positions between the open and closed positions.

7. The wearer comfort backpack vacuum of claim 6 , wherein the plate is a circular member which is rotatable about a central axis by means of an outwardly extending lever, the plate being separated from the cannister sidewalls by a flexible gasket.

8. The wearer comfort backpack vacuum of claim 6 , wherein the vacuum hose terminates outwardly in a vacuum nozzle which is used to contact a surface to be cleaned, and wherein adjustment of the plate with respect to the opening in the surrounding sidewalls of the cannister can be used as a vacuum brake/suction relief to reduce the degree of suction on the surface being cleaned when desired.