US4843835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator drain funnel
Assignee: Maytag Corp
•
Filing: 1988-09-27
•
Granted: 1989-07-04
•
Expires: 2008-09-27
Abstract
Abstract A rigid plastic twist lock drain funnel for conveying defrost water from the interior of the refrigerator cabinet, through the insulation space, to the exterior. A top portion of the funnel has a groove seating an O-ring, and a central portion has a pair of radially extending cam-shaped ears. During fabrication, the drain funnel is inserted from inside the refrigerator liner through an aperture having notches for receiving the ears, and then the funnel is twisted approximately 90° to engage the ears as a cam lock. In such arrangement, the funnel is securely attached to the liner and the O-ring provides a seal therebetween so as to prevent subsequently injected foam insulation from leaking to the interior of the cabinet. To allow for misalignment between the linear and the outer case, the opposite end of the drain funnel passes through an oversized hole in the outer case of the refrigerator. A spongy gasket around the lower end of the funnel is compressed between a shoulder of the funnel and the outer case so as to provide a seal therebetween.
Inventors
- 👤 Glenn E. Goetz
- 👤 Jeffrey L. Prunty
- 👤 Ramon L. Klemmensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/14; F25D2321/00; F25D2321/14; F25D2321/144; F25D2321/1442; F25D2321/146
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
92 words
Refrigerator drain apparatus adapted for being connected between an aperture in the liner and a hole in the outer casing before foaming-in-place and subsequently providing a passageway through the insulation for draining defrost water, said apparatus comprising: a rigid plastic conduit; means for twist-locking said conduit to said aperture in said liner; means for sealing said conduit to said liner for preventing insulation foam under pressure from leaking through said aperture; and means for sealing said conduit to said outer casing for preventing insulation foam under pressure from leaking through said hole.
Claim 2
Dependent Claim
92 words
Refrigerator drain apparatus adapted for being connected between an aperture in the liner and a hole in the outer casing before foaming-in-place and subsequently providing a passageway through the insulation for draining defrost water, said apparatus comprising: a rigid plastic conduit; means for twist-locking said conduit to said aperture in said liner; means for sealing said conduit to said liner for preventing insulation foam under pressure from leaking through said aperture; and means for sealing said conduit to said outer casing for preventing insulation foam under pressure from leaking through said hole.
Claim 3
Dependent Claim
23 words
The apparatus recited in claim 1 wherein said twist-lock means comprises at least a pair of cam-shaped ears integrally molded to said conduit.
Claim 4
Dependent Claim
14 words
The apparatus recited in claim 1 wherein said liner sealing means comprises an O-ring.
Claim 5
Dependent Claim
43 words
The apparatus recited in claim 1 wherein said conduit has a lower portion having a diameter smaller than a central portion defining a downwardly-facing shoulder, and said outer casing sealing means comprises a flexible gasket compressed between said shoulder and said outer casing.
Claim 6
Dependent Claim
154 words
Apparatus adapted for twist-locking in place between a notched aperture in the liner and a hole in the outer casing of a refrigerator before foaming-in-place and subsequently providing a passageway for defrost water to drain through the insulation space between the liner and the outer casing, said apparatus comprising: a rigid plastic conduit having an upper portion, a central portion having a downwardly-facing shoulder, and a lower portion; said central portion having at least one ear adapted for inserting through a notch of said notched aperture and twist-locking said conduit to said liner after rotation underneath peripheral portions of said aperture; and a gasket surrounding said lower portion of said conduit and seated against said shoulder wherein, after twist-locking said conduit in place, said gasket is compressed between said shoulder and peripheral portions of said hole thereby providing a seal between said conduit and said outer casing to prevent injected foam from leaking therebetween.
Claim 7
Dependent Claim
154 words
Apparatus adapted for twist-locking in place between a notched aperture in the liner and a hole in the outer casing of a refrigerator before foaming-in-place and subsequently providing a passageway for defrost water to drain through the insulation space between the liner and the outer casing, said apparatus comprising: a rigid plastic conduit having an upper portion, a central portion having a downwardly-facing shoulder, and a lower portion; said central portion having at least one ear adapted for inserting through a notch of said notched aperture and twist-locking said conduit to said liner after rotation underneath peripheral portions of said aperture; and a gasket surrounding said lower portion of said conduit and seated against said shoulder wherein, after twist-locking said conduit in place, said gasket is compressed between said shoulder and peripheral portions of said hole thereby providing a seal between said conduit and said outer casing to prevent injected foam from leaking therebetween.
Claim 8
Dependent Claim
41 words
The apparatus recited in claim 5 further comprising an O-ring engaged between said upper portion of said conduit and peripheral portions of said aperture thereby providing a seal between said conduit and said liner to prevent injected foam from leaking therebetween.
Claim 9
Dependent Claim
30 words
The apparatus recited in claim 5 wherein said upper portion comprises wings for manually twisting said conduit to rotate said at least one ear underneath peripheral portions of said aperture.
Claim 10
Dependent Claim
22 words
The apparatus recited in claim 5 wherein said central and lower portions of said conduit are inwardly tapered in a downward direction.
Claim 11
Dependent Claim
20 words
The apparatus recited in claim 5 wherein said upper portion of said conduit comprises a channel for seating said O-ring.
Claim 12
Independent Claim
100 words
The method of fabricating a refrigerator cabinet, comprising the steps of: providing an outer casing having a hole; providing an inner liner having an aperture; positioning said liner in spaced relationship within said outer casing with said aperture approximately aligned with said hole in said outer casing; inserting a rigid plastic conduit spanning between said aperture in said liner and said hole in said outer casing; twist-locking said conduit in place with respective ends of said conduit sealing to said liner and said casing; and injecting foam insulation under pressure into the space between said liner and said outer casing.
Claim 13
Independent Claim
100 words
The method of fabricating a refrigerator cabinet, comprising the steps of: providing an outer casing having a hole; providing an inner liner having an aperture; positioning said liner in spaced relationship within said outer casing with said aperture approximately aligned with said hole in said outer casing; inserting a rigid plastic conduit spanning between said aperture in said liner and said hole in said outer casing; twist-locking said conduit in place with respective ends of said conduit sealing to said liner and said casing; and injecting foam insulation under pressure into the space between said liner and said outer casing.
Claim 14
Dependent Claim
18 words
The method recited in claim 10 wherein an O-ring seals one end of said conduit to said liner.
Claim 15
Dependent Claim
32 words
The method recited in claim 10 wherein said conduit has a shoulder and said conduit is sealed to said outer casing by a gasket compressed between said shoulder and said outer casing.
Claim 16
Dependent Claim
47 words
The method recited in claim 10 wherein said conduit is twist-locked in place by a pair of cam-shaped ears that pass through corresponding notches in said aperture, said ears rotating under peripheral portions of said aperture when said conduit is twisted so as to provide said twist-locking.
Claim 17
Independent Claim
172 words
The method of manufacturing a refrigerator cabinet, comprising the steps of: providing an outer casing having a hole; providing an inner liner having an aperture with at least one twist-lock notch; providing a rigid plastic conduit having an upper portion, a central portion, and a lower portion, said central portion having a downwardly facing shoulder and at least one twist-lock ear; positioning an annular gasket around said lower portion of said conduit; positioning said inner liner in spaced relationship within said outer casing with said aperture approximately aligning with said hole in said outer casing; inserting said rigid plastic conduit through said aperture so that said twist-lock ear passes through said twist-lock notch and said lower portion extends through said hole, said gasket being compressed between said shoulder and said outer casing; twisting said conduit so that said ear rotates away from said notch and engages peripheral portions of said aperture thereby twist-locking said conduit to said liner; and injecting foam insulation into the space between said liner and said outer casing.
Claim 18
Independent Claim
172 words
The method of manufacturing a refrigerator cabinet, comprising the steps of: providing an outer casing having a hole; providing an inner liner having an aperture with at least one twist-lock notch; providing a rigid plastic conduit having an upper portion, a central portion, and a lower portion, said central portion having a downwardly facing shoulder and at least one twist-lock ear; positioning an annular gasket around said lower portion of said conduit; positioning said inner liner in spaced relationship within said outer casing with said aperture approximately aligning with said hole in said outer casing; inserting said rigid plastic conduit through said aperture so that said twist-lock ear passes through said twist-lock notch and said lower portion extends through said hole, said gasket being compressed between said shoulder and said outer casing; twisting said conduit so that said ear rotates away from said notch and engages peripheral portions of said aperture thereby twist-locking said conduit to said liner; and injecting foam insulation into the space between said liner and said outer casing.
Claim 19
Dependent Claim
23 words
The method recited in claim 14 wherein an O-ring seals said upper portion of said conduit to the upper side of said liner.
Claim 20
Dependent Claim
26 words
The method recited in claim 14 wherein said upper portion of said conduit comprises a pair of wings for manually applying torque to twist said conduit.
Claim 21
Dependent Claim
20 words
The method recited in claim 14 wherein said central portion of said conduit has a pair of cam-shaped twist-lock ears.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |