Self-renewing air filter

Details Self-renewing air filter Self-renewing air filter

2005-01-18

2005-01-18

Smith, Duane (Department: 1724)

Gas separation: processes

Filtering

Moving filter

C095S001000, C095S019000, C055S351000, C055S352000, C055S354000, C055S422000, C096S423000

Reexamination Certificate

active

06843834

ABSTRACT:
The replacement of filters for Heating, Ventilating, and Air Conditioning (HVAC) is often time-consuming and labor-intensive. Organizations having responsibility for many apartment or dormitory units can spend a significant fraction of their man-hours replacing such filters. A novel approach to reducing the labor for this task is to attach one end of sheet-type filtering material to a dispensing roll, and the other end to a gathering roll; both rolls being affixed to a frame. The assembly is installed into an air duct and the filtering material allowed to blouse, somewhat. The flow of air is intermittent in typical HVAC systems, so when the air begins to flow, the filtering material is forced, due to its resistance to flow, in the direction of the flow. This energy—a force applied through a distance—is utilized by a lever arm bracket to advance the gathering roll. In this fashion, new material leaves the dispensing roll and is exposed to the air, while the dirty filter sheet accumulates on the gathering roll. The process is self-regulating because dirty filter material will present a greater resistance to flow and will, therefore, travel through a greater distance, advancing the gathering roll more.

REFERENCES:
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patent: 4221576 (1980-09-01), Phillips, Jr.
patent: 4470833 (1984-09-01), Wolfe
patent: 4627863 (1986-12-01), Klein
patent: 6152998 (2000-11-01), Taylor
patent: 6168646 (2001-01-01), Craig et al.
patent: 6402822 (2002-06-01), Najm
patent: 6596059 (2003-07-01), Greist et al.
patent: 6632269 (2003-10-01), Najm

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