US4257892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drain cover
Assignee: Individual
•
Filing: 1979-12-19
•
Granted: 1981-03-24
•
Expires: 1999-12-19
Abstract
Abstract An improved drain cover comprising a one-piece top disc and depending cylindrical body adapted to be readily inserted into a drain pipe with the disc resting on the floor and overlying the pipe opening. The body is formed with four radial slots in which trapezoidal locking slugs are slidably positioned. The body is also formed with a central bore, the lower portion of which is adapted to receive a frusto-conical camming plug. A threaded bolt is slidably positioned through the disc and is threadedly engageable with the plug. When the bolt is tightened, it raises the plug into the bore where it cams the slugs outwardly into locking engagement with the drain pipe.
Inventors
- 👤 Donald J. Boersma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:59
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/12; E03C1/26; E03F; E03F5/00; E03F5/04; E03F5/0407
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A drain cover of the character described comprising: a cylindrical body adapted to be readily inserted into a drain pipe; a top disc of larger diameter than said cylindrical body and adapted to engage the top surface of the floor surrounding a drain pipe; draining openings formed in said disc and cylindrical body; adjustable locking means carried by said cylindrical body; wall means in said cylindrical body isolating said locking means from said drainage openings; and means associated with said body for selectively moving said locking means into locking engagement with a drain pipe wall, and being manually operable from above said disc when the drain cover is operationally positioned.
Claim 2
Dependent Claim
110 words
A drain cover of the character described comprising: a cylindrical body adapted to be readily inserted into a drain pipe; a top disc of larger diameter than said cylindrical body and adapted to engage the top surface of the floor surrounding a drain pipe; draining openings formed in said disc and cylindrical body; adjustable locking means carried by said cylindrical body; wall means in said cylindrical body isolating said locking means from said drainage openings; and means associated with said body for selectively moving said locking means into locking engagement with a drain pipe wall, and being manually operable from above said disc when the drain cover is operationally positioned.
Claim 3
Dependent Claim
38 words
A drain cover according to claim 1 wherein said body is formed with a plurality of radial slots opening to the outer vertical wall of said body, and said locking means comprises slugs slidably positioned in said slots.
Claim 4
Dependent Claim
36 words
A drain cover according to claim 2 wherein said body is formed with a central bore communicating with said slots, and said third mentioned means is movable in said bore for forcing said slugs radially outwardly.
Claim 5
Dependent Claim
60 words
A drain cover according to claim 3 wherein said bore comprises a frusto-conical lower section opening to the bottom of the body and a round upper section opening to the top disc, and said second mentioned means comprises a complementary frusto-conical plug having a threaded central threaded hole and a cooperating threaded bolt slidably positioned in said upper bore section.
Claim 6
Dependent Claim
54 words
A drain cover according to claim 4 wherein said slugs are trapezoidal in shape having short angled ends and opposed sharp corners, said plug acting on one of said angled ends to cam the same outwardly when the bolt is screwed tight and forcing the opposed sharp corner into locking engagement with the pipe.
Claim 7
Dependent Claim
39 words
A drain cover according to claim 4 and comprising further a pair of fins on said plug and pairs of opposed vertical slots formed in said lower bore section for receiving said fins and preventing rotation of said plug.
Claim 8
Dependent Claim
48 words
A drain cover according to claim 1 in which said top disc is slightly convex in section and comprises further a plurality of elongated arcuate weep holes and a depending lip which raises said weep holes slightly above the floor to permit drainage of low lying liquids therethrough.
Claim 9
Dependent Claim
20 words
A drain cover according to claim 7 wherein said top disc and cylindrical body comprise an integrally molded plastic structure.
References Cited (Backward Citations)
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US2800231A
Cited
US2928419A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |