Filter fan

• US 3,071,914 A
• Filed: 10/03/1960
• Issued: 01/08/1963
• Est. Priority Date: 10/03/1960
• Status: Expired due to Term

• Current Assignee: Jorgen Gesmar
• Original Assignee: Jorgen Gesmar
• Inventors: JORGEN GESMAR
• Application Number:
  US04/060,123
• Time in Patent Office: 827 Days
• US Class Current: 96/416
• CPC Class Codes: B01D 2273/30 Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
• CPC Class Codes: B01D 46/0086 Filter condition indicators
• CPC Class Codes: F24F 8/10 by separation, e.g. by filtering
• CPC Class Codes: F24F 8/108 using dry filter elements
• CPC Class Codes: Y10S 116/25 Air filter condition indicator

Claims

1. A FILTER FAN COMPRISING A CASING HAVING AN AIR INLET OPENING AND AN AIR EXHAUST OPENING;

A FAN MOUNTED IN SAID CASING FOR MOVING AIR IN SAID INLET OPENING AND OUT SAID EXHAUST OPENING;

A FILTER POSITIONED IN SAID CASING FOR FILTERING THE AIR PASSING THERETHROUGH;

A HOLLOW INDICATOR TUBE HAVING AN OPEN LOWER END IN COMMUNICATION WITH ATMOSPHERIC AIR OUTSIDE OF SAID CASING AND A CLOSED UPPER END;

A HOLLOW CONNECTING TUBE INTEGRALLY FORMED WITH SAID INDICATOR TUBE HAVING ONE OF ITS ENDS IN AIR COMMUNICATION WITH THE UPPER END OF SAID INDICATOR TUBE, THE OTHER END OF SAID CONNECTING TUBE EXTENDING INTO SAID CASING FOR TRANSMITTING THE AIR PRESSURE IN SAID CASING TO THE UPPER END OF SAID INDICATOR TUBE;

AND A FLOAT ARRANGED FOR MOVEMENT IN SAID INDICATOR TUBE, SAID FLOAT HAVING AN OBSERVABLE POSITION AT THE UPPER END OF SAID INDICATOR TUBE AND AN OBSERVABLE POSITION AT THE LOWER END OF THE INDICATOR TUBE AND BEING INSTANTANEOUSLY MOVABLE FROM ONE OF SAID POSITIONS TO THE OTHER ONE OF SAID POSITIONS FOR INDICATING THE CONDITION OF THE FILTER.