CA1225170A - Upholstered seat for clean room use - Google Patents

Upholstered seat for clean room use

Info

Publication number
CA1225170A
CA1225170A CA000473331A CA473331A CA1225170A CA 1225170 A CA1225170 A CA 1225170A CA 000473331 A CA000473331 A CA 000473331A CA 473331 A CA473331 A CA 473331A CA 1225170 A CA1225170 A CA 1225170A
Authority
CA
Canada
Prior art keywords
filter sheet
air
panel member
sheet
clean rooms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000473331A
Other languages
French (fr)
Inventor
James W. Frobose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AJUSTO EQUIPMENT LP
Original Assignee
AJUSTO EQUIPMENT LP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AJUSTO EQUIPMENT LP filed Critical AJUSTO EQUIPMENT LP
Priority to CA000473331A priority Critical patent/CA1225170A/en
Application granted granted Critical
Publication of CA1225170A publication Critical patent/CA1225170A/en
Expired legal-status Critical Current

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  • Filtering Materials (AREA)

Abstract

UPHOLSTERED SEAT FOR CLEAN ROOM USE

Abstract To assist in maintaining the high degree of cleanliness required by Federal standards in industrial clean rooms, an upholstered seat is provided having a sealed filter element through which air must flow when entering or exiting the seat structure. A hard base member having a cushion mounted thereon is enclosed within an air-imperme-able cover. The filter element in the form of a hydrophilic or hydrophobic sheet is placed between the hard base member and cover. The hard base member and cover contain air breathing apertures on opposite sides of the filter element. The upholstered seat exceeds Federal standards in its ability to avoid contaminating clean rooms.

Description

I

UPHOLSTERED SEAT FOR CLEAN ROOM USE
Background of the Invention The manufacture of microchips and some other industrial products has created a necessity for an extreme degree of cleanliness in manufacture in facilities, commonly called clean rooms As result of these cleanliness requirements, Federal standards have been promulgated and must be strictly complied with by the industries involved. Current Federal Standard No. 209B pertaining to classes of room cleanliness establishes three classes of clean rooms, Class 100 being the strictest of these Jo classes. Class 100 specifies that only 100 particles of 0.5 micron size or larger are allowed per cubic foot of air in the clean room. The standard does not pertain to merely an average foot ox air but to any cubic foot, at any time. Suggested air veto-cities are also listed for each class under Federal Standard No. 209B.
A main object of the present invention is to fully comply with and substantially exceed the requirements of Class 100 under Federal Standard No. 209B, in connection with upholstered furniture for clean room use, such as chairs, stools and other seat structures.
Presently, no conventional upholstered furniture or wooden furniture can be tolerated in clean rooms because of the micro particles expelled by them into the environment during normal usage.
Such furniture falls far short of even the most liberal class under Federal Standard No. 209B, namely Class 100,000. Metal furniture, such as furniture made entirely of stainless steel, can meet the Federal standards but such furniture becomes so uncomfortable during long usage as to be into--enable, and does not represent a complete solution to the problem.
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A further object of the present invention is to provide comfortable upholstered furniture, including various types of seats for clean room usage which fully comply with and exceed the clean-lioness requirements under Federal standards or self-imposed industrial standards.
Another object of the invention is to provide seat cushions or seat backs in upholstered forms which include sealed air-impermeable coverings for the yielding cushions and hard base members thereof, in conjunction with a highly efficient filter element through which all air must flow when leaving or entering the upholstered furniture struck lure.
The filter element embodies in the invention is either a hydrophilic or hydrophobic sheet element possessing the ability to exclude particles as small as 0.2 microns prom passing through the filter eye-mints, thus exceeding substantially the require-mints of Class 100 under Federal Standard No. 209B.
The sheet filter element is interposed between the hard panel member of the seat or other body support component of upholstered furniture and the exterior air-impermeable cover. Breathing aver-lures are provided in the hard panel member Andover which may be in registering or non-register-in staggered relationship. In either case, air leaving or entering the structure through the breathing openings must also traverse the filter element, thus preventing particle contamination of the surrounding environment.
Other features and advantages of the in mention will become apparent to those skilled in the art during the course of the following detailed description by reference to the accompanying drawings.
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~Z253 7(~1 Brief description of the Drawings -Figure 1 is a perspective view of an upholstered chair for clean rooms according to the present invention.
Figure 2 is an enlarged bottom plan view, parts broken away, of the upholstered seat portion of the chair in Figure 1 Figure 3 is a further enlarged vertical section taken on line 3-3 of Figure 2.
Figure 4 is a further enlarged fragmentary vertical section through the upholstered seat : portion of the same plane as Figure 3.
Detailed De lotion -Referring to the drawings in detail, wherein like numerals designate live parts, a typical up-holstered technician's chair lo for a clean room according to the invention is shown in Figure 1.
The invention is equally applicable to other types of upholstered clean room furniture, such as stools, other types of chairs or benches. The chair 10 in Figure 1 includes a metal pedestal 11, an uphold ; stored seat 12 attached to the pedestal, and an upholstered backrest 13 adjustable attached to a metal arm 14 rising from the seat 12. The invention herein is embodied in the seat 12 and backrest Andy can be similarly embodied in any upholstered furniture body supporting surface.
Figures 2, 3 and 4 showing the essence of the invention depict in detail the structure of the chair seat 12 in Figure 1. Substantially the identical details apply to the backrest 13 or to any body supporting portion of other upholstered foreign-lure for clean rooms according to the invention.
The seat 12 comprises a substantially rigid preferably contoured base panel member 15 of wood or the like, on the upper face of which is mounted a resilient cushion 16 of suitable material, such as foam rubber or roam plastics material.
A filter element in the form of a sheet 17 of hydrophilic or hydrophobic material is applied over the lower face of rigid panel member 15 and near its margin is attached and sealed to the member 15 by a continuous layer 18 of adhesive sealant, Figure 4. The adhesive sealant extends around the entire margin of the filter element 17 and precludes the passage of air outwardly or inwardly between the element 17 and panel member 15.
The sheet filter element 17 may be formed of hydrophilic material manufactured by German Sciences, Inc., Ann Arbor, Michigan, under the trademark VERSAPOR, Manufacturer I 9 No. V-200, or their hydrophobic material, Manufacturer's No.
VOW. Similar material manufactured by other companies may also be used This filtering medium can preclude the passage there through of particles as small as 0.2 microns. The particular material is employed to substantially exceed the requirements under Class 100 of Federal Standard No. 209B.
An air-impermeable preferably vinyl top cover section 19 is stretched over the cushion 16 and base panel member 15, with a lower marginal edge portion 20 thereof attached permanently to the bottom face of the member 15 by a line of staples 21 or equivalent means. The edge 22 of top cover section 19 is sealed to the sheet filter element 17 by a continuous bead 23, Figure 4, ox adhesive air-impermeable sealant, so that air cannot pass outwardly or inwardly between the element 17 and top cover section 19.
A bottom cover section 24 of sheet vinyl I; is applied over the bottom face of rigid panel ~Z~5~

member 15, and a double thickness marginal fold 25 of this bottom cover section is permanently attached to the member 15 by parallel lines of staples 26 near the margin of the seat 12, to prevent air con-lamination due to frayed edges The rigid panel member 15 near its oppo-site sides is provided with a pair of breathing openings 27 extending completely there through.
similarly, the bottom cover section 24 has a pair of breathing openings 28 formed there through. The breathing openings 27 an 28 may be in registering relationship on opposite sides of the element 17 or may be out of registration and staggered, as illustrated. The non-registering arrangement of the openings 27 and 28 possesses the advantage that the sheet filter element 17 cannot readily be punctured or damaged if an object is inserted in the opening 28, because the element 17 is backed up or reinforced by the hard member 15. When the openings 27 and 28 are in registration, it would be possible to rupture the element 17 were an object inserted through an opening 28.
However, either arrangement of the breath-in openings 27 and 28 is operationally satisfac-tory, and in both cases air can enter the seat structure and be expelled therefrom only by passing through the openings 27 and 28 and also through the sheet filter element 17 disposed there between. In the case of registering breathing openings, not shown, the air passage is direct or axial with respect to the openings 27 and 28, whereas in the illustrated arrangement where the breathing openings are non~r~gistering, the in flowing or outflowing air passes through one breathing opening and then along and through the filter element 17 to the Sue other breathing opening on a zigzag path. It should now be clear that no air can enter or exit the seat structure on any other pathway due to the sealed arrangement of the air-impermeable cover sections 19 and 24 and the sealed relationship of the element 17 with panel member 15 and top cover section 19.
In the embodiment shown in Figure 1, the seat 12 is attached by screws 29 to a flange 30 of the chair pedestal 11. These screws penetrate the member 15 and are dipped in adhesive sealant before installation. The lower cover section 24 can be aperture at 31, Figure 2, adjacent to the screws 29.
The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described or portions thereof but it is recognized that various modifications are possible within the scope of the invention claimed.

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Claims (12)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLU-SIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:
1. In upholstered furniture for clean rooms, a body support portion, said portion compris-ing a substantially rigid panel member, a yielding cushion on the panel member, a filter sheet sub-stantially covering the face of the panel member remote from said cushion and being sealed thereto by a continuous air-impermeable seal near the margin of the filter sheet, the filter sheet being formed of material capable of preventing the passage therethrough of particles at least as small as 0.5 microns, an air-impermeable cover enclosing the rigid panel member, cushion and filter sheet, and the rigid panel member and air-impermeable cover each having at least a breathing opening formed therethrough on opposite sides of the filter sheet, whereby air entering or leaving the body support portion must flow through said breathing openings and filter sheet.
2. In upholstered furniture for clean rooms as defined in claim 1, and said filter sheet comprising a sheet of material of a type capable of preventing the passage therethrough of particles as small as 0.2 microns.
3. In upholstered furniture for clean rooms as defined in claim 2, and the breathing openings of said panel member and air-impermeable cover being in non-registering relationship on opposite sides of the filter sheet.
4. In upholstered furniture for clean rooms as defined in claim 3, and the non-registering breathing openings being in two pairs near opposite sides of said body support portion.
5. In upholstered furniture for clean rooms as defined in claim 1, and the rigid panel member and air-impermeable cover each having a pair of breathing openings formed therethrough on oppo-site sides of the filter sheet near opposite margins of the body support portion.
6. In upholstered furniture for clean rooms as defined in claim 1, and the body support portion comprising a seat portion.
7. In upholstered furniture for clean rooms as defined in claim 1, and the body support portion comprising a backrest.
8. In upholstered furniture for clean rooms as defined in claim 1, and said air-impermeable cover including top and bottom cover sections of sheet material, the top cover section including a marginal portion overlapping a corresponding portion of said filter sheet and being sealed to the latter by a continuous seal between the marginal edge of the top cover section and the adjacent face of the filter sheet, and said seal being on the opposite side of the jilter sheet from a first-named continuous air-impermeable seal.
9. In upholstered furniture for clean rooms as defined in claim 8, and said seals being formed of an adhesive sealant.
10. An upholstered body support element for clean room furniture comprising a padded sub-stantially rigid panel member, a filter sheet substantially covering one face of the panel member and being hermetically sealed thereto around the margin of the filter sheet, an air-impermeable cover of sheet material enclosing the padded panel member and filter sheet, and the panel member and said cover each having at least an air breathing opening formed therethrough on opposite sides of the filter sheet, the filter sheet being of a type which can prevent the passage therethrough of particles of fractional micron sizes.
11. In upholstered furniture for clean rooms as defined in claim 2, and said filter sheet comprising a sheet of hydrophilic material.
12. In upholstered furniture for clean rooms as defined in claim 2, and said filter sheet com-prising a sheet of hydrophobic material.
CA000473331A 1985-01-31 1985-01-31 Upholstered seat for clean room use Expired CA1225170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA000473331A CA1225170A (en) 1985-01-31 1985-01-31 Upholstered seat for clean room use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000473331A CA1225170A (en) 1985-01-31 1985-01-31 Upholstered seat for clean room use

Publications (1)

Publication Number Publication Date
CA1225170A true CA1225170A (en) 1987-08-04

Family

ID=4129729

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000473331A Expired CA1225170A (en) 1985-01-31 1985-01-31 Upholstered seat for clean room use

Country Status (1)

Country Link
CA (1) CA1225170A (en)

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Effective date: 20050131