Method and apparatus for providing clean air

• US 4,749,385 A
• Filed: 03/27/1987
• Issued: 06/07/1988
• Est. Priority Date: 03/27/1987
• Status: Expired due to Term

• Current Assignee: RCA Corporation (General Electric Company)
• Original Assignee: RCA Licensing Corporation
• Inventors: McCoy, Randall E., Brunner, Glenn W., Pearlman, Samuel, Nelson, Jordan R.
• Primary Examiner(s): SPITZER, ROBERT H
• Application Number:
  US07/030,638
• Time in Patent Office: 438 Days
• Field of Search: 55/80, 55/97, 55/267, 55/320, 55/332, 55/467, 55/471, 55/473, 55/DIG. 18
• US Class Current: 95/273
• CPC Class Codes: B01D 46/00 Filters or filtering processes specially modified for separating dispersed particles from gases or vapours filtering elements B01D24/00-B01D35/00; filtering material B01D39/00; their regeneration outside the filters B01D41/00
• CPC Class Codes: B01D 46/10 Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
• CPC Class Codes: F24F 2221/12 transportable
• 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: F24F 8/80 Self-contained air purifiers
• CPC Class Codes: Y10S 55/18 Work bench

Abstract

A method of providing clean air to a workpiece comprises positioning the workpiece adjacent to a first opening in a conduit. The conduit includes a central segment and a peripheral segment having, respectively, the first opening and a second opening disposed at opposite ends of the conduit. The peripheral segment surrounds the central segment such that the first opening is substantially coplanar with the second opening. A laminar flow of air is created through the conduit in a direction away from the second opening and toward the first opening. The air flow is filtered through a HEPA filter supported within the conduit.

Claims

1. A method of providing clean air to a workpiece comprising the steps of:

positioning said workpiece adjacent to a first opening in a conduit including a central segment and a peripheral segment having, respectively, said first opening and a second opening disposed at opposite ends of said conduit, such that said first opening is substantially coplanar with said second opening, the dimensions of said first opening being similar to that of said workpiece;

creating a laminar flow of air through said conduit in a direction away from said second opening and toward said first opening; and

filtering said air flow.

2. A method as recited in claim 1 wherein said conduit comprises a first boxlike structure having said first opening at one end thereof and a connecting opening at the end opposite said one end to form said central segment, said first structure being disposed within a second boxlike structure, larger than said first structure and open at one end thereof, to form said peripheral segment such that said peripheral segment communicates with said central segment through said connecting opening.

3. A method as recited in claim 2 wherein said laminar flow creating step is performed by operating a fan supported by said first boxlike structure adjacent to said connecting opening.

4. A method as recited in claim 2 wherein said filtering step is performed by placing a High-Efficiency Processed Air (HEPA) filter within said first boxlike structure.