Patent US3722684A successfully refreshed from Google Patents.
US3722684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equipment for pre filtering the solvent particularly in dry cleaning machines
Assignee: Individual
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Filing: 1970-10-20
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Granted: 1973-03-27
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Expires: 1990-10-20
Abstract
Abstract An equipment for pre-filtering the solvent in dry-cleaning machines or plants, said equipment comprising a chamber wherein drained dirty solvent is forced to pass across a filtering surface which is continuously cleaned by scraping means, relatively movable with respect to said filtering surface. Said filtering surface is in the form of an outer surface of a revolvingly fitted perforated drum; whereon a scraping blade is acting in order to remove any dirt therefrom and collect the same within a collecting box or the like.
Inventors
- 👤 G Maestrelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:15
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/014; B01D29/11; B01D29/117; B01D29/96; B01D33/00; B01D33/06; B01D33/073; B01D33/44; B01D33/46; B01D33/466
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
A pre-filtering equipment for the solvents used in machines and plants having a chamber wherein garments, fabrics, hosieries, carpets and the like are dry-cleaned or dry-processed, comprising a casing connected to an outlet duct from said chamber, a revolving foraminous drum in said casing, a solvent suction pump having a suction duct connected to said casing, controlled valve means whereby said solvent is allowed to flow from said duct to said suction duct in order to be pre-filtered by said drum, cleaning means inclined against the direction of rotation of said drum cooperating with said drum to positively strip fibrous material from the surface of said drum, collecting means for the impurities and dirt removed from said solvent, and a stationary perforated wall fitted below the lower half of said revolving drum and radially spaced therefrom by a distance which gradually increases in the direCtion of the drum rotation from the zone wherein said drum is acted upon by said cleaning means.
Claim 2
Dependent Claim
162 words
A pre-filtering equipment for the solvents used in machines and plants having a chamber wherein garments, fabrics, hosieries, carpets and the like are dry-cleaned or dry-processed, comprising a casing connected to an outlet duct from said chamber, a revolving foraminous drum in said casing, a solvent suction pump having a suction duct connected to said casing, controlled valve means whereby said solvent is allowed to flow from said duct to said suction duct in order to be pre-filtered by said drum, cleaning means inclined against the direction of rotation of said drum cooperating with said drum to positively strip fibrous material from the surface of said drum, collecting means for the impurities and dirt removed from said solvent, and a stationary perforated wall fitted below the lower half of said revolving drum and radially spaced therefrom by a distance which gradually increases in the direCtion of the drum rotation from the zone wherein said drum is acted upon by said cleaning means.
Claim 3
Dependent Claim
53 words
An equipment according to claim 1 wherein said cleaning means comprises a scraping blade having a free edge engaged against the outer surface of said revolving drum under a given pressure and said collecting means comprise a perforated box within said casing having an opening directed toward the bottom of said cleaning means.
Claim 4
Dependent Claim
38 words
An equipment according to claim 1, wherein said stationary perforated wall at the point wherein said distance thereof from said revolving drum is at its minimum value, is directly facing a related perforated wall of said collecting means.
Claim 5
Dependent Claim
41 words
An equipment according to claim 2, wherein said scraping blade is kept engaged against the outer surface of said revolving drum by adjustable pressure means in order to obtain a required engagement pressure of said scraping blade against said drum surface.
Claim 6
Dependent Claim
62 words
An equipment according to claim 2, wherein the edge of said scraping blade opposite to said scraping edge comprises means to allow a blade swinging motion about said edge, said means comprising a pin preferably parallel to the revolving drum axis fastened to said blade and means acting on said pin to pressure engage said scraping blade edge against said drum surface.
Claim 7
Dependent Claim
33 words
An equipment according to claim 1, wherein a geared motor is operatively connected to the shaft of said drum and means responsive to said controlled valve means for selectively operating said geared motor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |