US3750374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas filters
Assignee: Delbag Luftfilter GmbH
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Filing: 1971-06-07
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Granted: 1973-08-07
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Expires: 1991-06-07
Abstract
Abstract Air filter structure primarily for the ceilings of clean rooms, the structure being formed from a profiled section which can be bolted to a similar structure and hung from the ceiling or supported from a wall each structure being formed to releasably carry a filter, arrangements being provided for filters of different thicknesses, the structure being such that with the filter in place it makes a dust light unit; arrangements may be made for the structure to carry a lighting unit; the structure when bolted to a similar structure may be hung from the ceiling from a web extending upward from the profile section; the releasing arrangements for the filter comprise a clamp which can be screwed down on filters on either side with the filters bearing against a sealing face on the profiled section.
Inventors
- 👤 G Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:03
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
256 words
A structure for the support of air filters, comprising: adjacent support frames interconnected together; profiled sections substantially S-shaped in cross-section defining each said frame; pairs of said adjacent sections together defining a hollow box-like portion; each said section having an upstanding web, an upper horizontal web extending inwardly of each frame, a downwardly directed oblique web extending from said horizontal web, a middle vertical web extending downwardly from said oblique web, a horizontal flange extending inwardly of each frame from said vertical web, a lower vertical web extending downwardly from said horizontal flange, an intermediate horizontal flange and a lower horizontal flange on said lower vertical web each extending outwardly of each said frame; each of said upstanding webs having a bore therein for the accommodation of suspension means for each said frame; each of said middle vertical webs having a bore therein; means interconnecting said adjacent sections together extending through adjacent ones of said middle vertical web bores; said intermediate and lower flanges each having semicircular recesses at their respective free ends; a releasable clamping and locking means defined by a rotatably mounted threaded spindle disposed within the hollow box-like portion received within said semi-circular recesses of said horizontal flanges of said adjacent sections; a clamping element on each said spindle for clamping an air filter panel within each said frame between each said clamping element and said upper horizontal web; each said clamping element being located on each said spindle for movement toward and away from said horizontal webs upon rotation of its spindle.
Claim 2
Dependent Claim
256 words
A structure for the support of air filters, comprising: adjacent support frames interconnected together; profiled sections substantially S-shaped in cross-section defining each said frame; pairs of said adjacent sections together defining a hollow box-like portion; each said section having an upstanding web, an upper horizontal web extending inwardly of each frame, a downwardly directed oblique web extending from said horizontal web, a middle vertical web extending downwardly from said oblique web, a horizontal flange extending inwardly of each frame from said vertical web, a lower vertical web extending downwardly from said horizontal flange, an intermediate horizontal flange and a lower horizontal flange on said lower vertical web each extending outwardly of each said frame; each of said upstanding webs having a bore therein for the accommodation of suspension means for each said frame; each of said middle vertical webs having a bore therein; means interconnecting said adjacent sections together extending through adjacent ones of said middle vertical web bores; said intermediate and lower flanges each having semicircular recesses at their respective free ends; a releasable clamping and locking means defined by a rotatably mounted threaded spindle disposed within the hollow box-like portion received within said semi-circular recesses of said horizontal flanges of said adjacent sections; a clamping element on each said spindle for clamping an air filter panel within each said frame between each said clamping element and said upper horizontal web; each said clamping element being located on each said spindle for movement toward and away from said horizontal webs upon rotation of its spindle.
Claim 3
Dependent Claim
56 words
The structure according to claim 1 further comprising a cap nut engaged with the lower end of each said threaded spindle which extends downwardly beyond said lower horizontal flanges; the upper end of each said spindle extending upwardly above said intermediate flanges; and a threaded nut in engagement with said upper end of each said spindle.
Claim 4
Dependent Claim
21 words
The structure according to claim 2 wherein nylon bushes are provided on each said spindle in engagement with said semi-circular recesses.
Claim 5
Dependent Claim
19 words
The structure according to claim 3 further comprising sealing means provided between said oblique webs of said adjacent sections.
Claim 6
Dependent Claim
44 words
The structure accoRding to claim 4 wherein an end one of said frames is capable of being interconnected with a side wall by means of an anchor rail element interconnected with said upper horizontal web of an outer section of said hollow box-like portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |