Cartridge filter with integrated threading having anti-rotation feature
First Claim
1. A filter cartridge, comprising:
- a ring of filter media circumscribing a central cavity and having upper and lower ends,an upper end cap sealingly engaging the upper end of the filter media, and a lower end cap with an upper surface sealingly engaging the lower end of the filter media, and a ring-shaped member attached to and projecting axially downward away from a lower surface of the second end cap, said ring-shaped member having an annular portion with threads whereby a collection bowl with threads can be removably connected to the ring-shaped member, said ring-shaped member further including radial flow passages whereby contaminants may pass from a peripheral region of said filter cartridge interiorly of said ring-shaped member and downwardly into the attached collection bowl; and
said ring-shaped member further including an anti-rotation device disposed on the annular portion, whereby said anti-rotation device can mate with a corresponding anti-rotation device on a casing to rotationally fix the filter cartridge with respect to the casing, wherein said anti-rotation device on said annular portion comprises at least one radially-outward projecting key disposed on a radially-outer surface of the annular portion.
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Accused Products
Abstract
A filter includes a casing enclosing a filter cartridge and a removable collection bowl. The filter cartridge includes a filter media ring with upper and lower end caps. The lower end cap of the filter cartridge has a ring-shaped member projecting axially downward. The ring-shaped member has an annular portion with radially inward-directed threads, whereby the collection bowl, with radially outward-directed threads, can be removably attached to the cartridge. The ring-shaped member further includes radial flow passages between the threads and the end cap, whereby contaminants may pass from a peripheral region of the filter element interiorly of the ring-shaped member and downwardly into the attached collection bowl. The filter includes an anti-rotation feature, comprising radially outward-directed keys, disposed circumferentially around the annular portion of the ring-shaped member and projecting radially-outward therefrom, and slots formed on the inside surface of the casing. The keys and slots rotationally fix the filter cartridge with respect to the casing when the cartridge is installed in the casing, such that the collection bowl can be threaded onto and off of the cartridge. The collection bowl and ring-shaped member trap a radially-inward directed portion of the casing and a resilient gasket to fluidly-seal the collection bowl to the cartridge.
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Citations
25 Claims
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1. A filter cartridge, comprising:
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a ring of filter media circumscribing a central cavity and having upper and lower ends, an upper end cap sealingly engaging the upper end of the filter media, and a lower end cap with an upper surface sealingly engaging the lower end of the filter media, and a ring-shaped member attached to and projecting axially downward away from a lower surface of the second end cap, said ring-shaped member having an annular portion with threads whereby a collection bowl with threads can be removably connected to the ring-shaped member, said ring-shaped member further including radial flow passages whereby contaminants may pass from a peripheral region of said filter cartridge interiorly of said ring-shaped member and downwardly into the attached collection bowl; and
said ring-shaped member further including an anti-rotation device disposed on the annular portion, whereby said anti-rotation device can mate with a corresponding anti-rotation device on a casing to rotationally fix the filter cartridge with respect to the casing, wherein said anti-rotation device on said annular portion comprises at least one radially-outward projecting key disposed on a radially-outer surface of the annular portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A filter cartridge removably positionable within a cylindrical casing having anti-rotation slots disposed circumferentially around an inside surface of the casing, the filter cartridge comprising:
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a ring of filter media circumscribing a central cavity and having upper and lower ends, an upper end cap with a first surface bonded to the upper end of the filter media, and a lower end cap with a first surface bonded to the lower end of the filter media, and a ring-shaped member projecting axially downward, away from a second surface of the second end cap, said ring-shaped member having an annular threaded portion whereby a collection bowl with threads can be removably attached to the filter element;
said ring-shaped member further including flow passages between said threads and said second surface whereby contaminants may pass from a peripheral region of said filter cartridge interiorly of said ring-shaped member and downwardly into the attached collection bowl; and
said ring-shaped member further including a plurality of anti-rotation keys disposed circumferentially around the annular portion, whereby said anti-rotation keys can mate with the anti-rotation slots on the casing to rotationally fix the filter cartridge with respect to the casing. - View Dependent Claims (11, 12, 22, 23)
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13. A filter subassembly, comprising:
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a cylindrical casing having a radially in-turned lower end with anti-rotation devices disposed circumferentially around an inner surface of the casing toward the lower end, a collection bowl for attachment to the lower end of the casing, said collection bowl including a cup-shaped body and an annular threaded portion, and a filter cartridge removably disposed within the casing, said filter cartridge including a ring of filter media separating a central cavity from a peripheral cavity in the casing and having upper and lower ends, an upper end cap with a first surface sealingly engaging the upper end of the filter media, and a lower end cap with a first surface sealingly engaging the lower end of the filter media, a ring-shaped member attached to and projecting axially downward, away from a second surface of the second end cap and supported by the in-turned lower end of the casing, said ring-shaped member having an annular threaded portion removably receiving the threads of the collection bowl; and
said ring-shaped member further including flow passages between said threaded portion and said second surface whereby contaminants may pass from the peripheral cavity interiorly of said ring-shaped member and downwardly into the attached collection bowl; and
said ring-shaped member further including a plurality of anti-rotation devices disposed circumferentially around the annular portion and projecting radially-outward therefrom, said anti-rotation devices of said ring-shaped member mating with the anti-rotation devices on the casing to rotationally fix the filter cartridge with respect to the casing when the collection bowl is screwed onto the ring-shaped member. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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24. A filter cartridge removably positionable within a cylindrical casing having an anti-rotation device disposed on an inside surface of the casing, the filter cartridge comprising:
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a ring of filter media circumscribing a central cavity and having upper and lower ends, an upper end cap with a first surface bonded to the upper end of the filter media, and a lower end cap with a first surface bonded to the lower end of the filter media, and a ring-shaped member projecting axially downward, away from a second surface of the second end cap, said ring-shaped member having an annular threaded portion whereby a collection bowl with threads can be removably attached to the filter element;
said ring-shaped member further including flow passages between said threads and said second surface whereby contaminants may pass from a peripheral region of said filter cartridge interiorly of said ring-shaped member and downwardly into the attached collection bowl; and
said ring-shaped member further including radially outward projecting key means for cooperating with the anti-rotation device on the casing to rotationally fix the filter cartridge with respect to the casing. - View Dependent Claims (25)
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Specification