US4422790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connecting means for filter cartridges
Assignee: Knecht Filterwerk GmbH
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Filing: 1982-03-25
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Granted: 1983-12-27
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Expires: 2002-03-25
Abstract
Abstract For lubricating-oil filters for combustion engines, wherein the space available for the installation and removal of the filter cartridge is very confined, there are provided, instead of one filter cartridge, at least two filter cartridges which are axially arranged in series one behind the other. In order to allow these filter cartridges to be installed or removed without difficulties, there is proposed for the connection of these filter cartridges an articulated connecting means which ensures that the filter cartridges can be tilted relative to each other. A clip hinge or a wire or plastics-material strip, provided with clasps or detents, can be used as the connecting means.
Inventors
- 👤 Hans Gebert
- 👤 Manfred Loffelhardt
- 👤 Gerhard Obernosterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:08
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/52; B01D29/54; B01D2201/00; B01D2201/04; B01D2201/0415; B01D2201/40; B01D2201/4084; Y; Y10; Y10T; Y10T403/00; Y10T403/16; Y10T403/55; Y10T403/557
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
Means for connecting at least two filter elements, which are axially arranged in series and are designed as filter cartridges, of a fluid filter, more especially a lubricating-oil filter for internal-combustion engines, characterised in that the connecting means is designed as a joint for tilting the filter cartridges relative to each other during the installation and removal thereof, said connecting means being in the form of a clip hinge made of a plastics-material injection moulding provided with an integrally formed film hinge, said clip hinge engaging with its free ends in the inner ports in the respective end discs of the filter elements, said clip hinge having free ends comprising detents which engage over the end discs of the filter elements, and having two other ends which in the installed position are in operative engagement with each other and comprise conically extending ring sections, which correspond to each other.
Claim 2
Dependent Claim
149 words
Means for connecting at least two filter elements, which are axially arranged in series and are designed as filter cartridges, of a fluid filter, more especially a lubricating-oil filter for internal-combustion engines, characterised in that the connecting means is designed as a joint for tilting the filter cartridges relative to each other during the installation and removal thereof, said connecting means being in the form of a clip hinge made of a plastics-material injection moulding provided with an integrally formed film hinge, said clip hinge engaging with its free ends in the inner ports in the respective end discs of the filter elements, said clip hinge having free ends comprising detents which engage over the end discs of the filter elements, and having two other ends which in the installed position are in operative engagement with each other and comprise conically extending ring sections, which correspond to each other.
Claim 3
Dependent Claim
93 words
Means for connecting at least two filter elements, which are axially arranged in series and are designed as filter cartridges, of a fluid filter, more especially a lubricating-oil filter for internal-combustion engines, characterised in that the connecting means is designed as a joint for tilting the filter cartridges relative to each other during the installation and removal thereof, said connecting means being in the form of a wire which passes through the two end discs of the facing front ends of the filter elements and which is provided with clasps at its ends.
Claim 4
Dependent Claim
93 words
Means for connecting at least two filter elements, which are axially arranged in series and are designed as filter cartridges, of a fluid filter, more especially a lubricating-oil filter for internal-combustion engines, characterised in that the connecting means is designed as a joint for tilting the filter cartridges relative to each other during the installation and removal thereof, said connecting means being in the form of a wire which passes through the two end discs of the facing front ends of the filter elements and which is provided with clasps at its ends.
Claim 5
Dependent Claim
92 words
Means for connecting at least two filter elements, which are axially arranged in series and are designed as filter cartridges, of a fluid filter, more especially a lubricating-oil filter for internal-combustion engines, characterised in that the connecting means is designed as a joint for tilting the filter cartridges relative to each other during the installation and removal thereof, said connecting means being in the form of an elastic plastics-material strip which passes through the two end discs of the facing front ends of the filter elements and which is provided with detents.
Claim 6
Dependent Claim
92 words
Means for connecting at least two filter elements, which are axially arranged in series and are designed as filter cartridges, of a fluid filter, more especially a lubricating-oil filter for internal-combustion engines, characterised in that the connecting means is designed as a joint for tilting the filter cartridges relative to each other during the installation and removal thereof, said connecting means being in the form of an elastic plastics-material strip which passes through the two end discs of the facing front ends of the filter elements and which is provided with detents.
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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |