US3851788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic drum with removable cover and locking ring
Assignee: Individual
•
Filing: 1973-11-14
•
Granted: 1974-12-03
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Expires: 1993-11-14
Abstract
Abstract The neck portion, extending above the bead of a plastic drum, is provided with an in-bulging section adjacent its top, to form an annular bead of smaller diameter than the neck, and with a plurality of circumferentially spaced, out-bulging extensions, each of which has a lower surface slanting upward away from the neck. A tightly fitting cylindrical cover, which is not quite as long as the neck, and fits over the latter, has a recessed top and a lip-like reinforcement extending downward from the underside of the recessed top to form an annular groove of such width as to accommodate the bead on the neck of the drum. The cover has cut out portions through which the bulge-like extensions protrude and reinforcing extensions at the lower extremities of the remaining segments. These extensions have upper surfaces slanting away from the cover at such an angle that, with the lower surfaces of adjacent bulges on the neck, they define an acute angle. A spring steel locking ring engages these surfaces to draw the cover down tight about the neck and seal the drum.
Inventors
- 👤 W Hammes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:08
CPC Classifications
B; B65; B65D; B65D45/00; B65D45/32; B65D1/00; B65D1/12; B65D1/14; B65D1/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
239 words
A drum and cover therefor comprising: a drum body portion of plastic composition having a cylindrical neck extending axially parallel to the axis of the drum, a drawn-in portion adjacent the top of the neck forming an annular bulged-in bead of smaller diameter than the neck, a plurality of bulge-like projections disposed circumferentially about tHe neck, each of said bulge-like projections having a lower surface slanting away from the outer cylindrical surface of the neck; closure means for said drum comprising a cover having an outer cylindrical portion adapted to fit tightly over the neck of drum, said outer cylindrical portion having cut out sections adapted to fit snugly over the bulge-like projections on the neck of the drum, an inner cylindrical portion coaxial with and of smaller diameter than the outer cylindrical portion, said two portions being connected to form an external rim and an inner annular groove, a lip-like reinforcement on the underside of said inner portion providing a bearing surface for the bead on the neck of the drum, and outwardly projecting reinforcements on the lower edges of the segments of the cover between the bulge-like projections on the neck of the drum, each of said reinforcements having a surface slanting away from the outer cylindrical surface of the cover; sealing means in the bottom of the aforementioned annular groove; and resilient locking means encircling the cover for securing said cover to the neck of drum.
Claim 2
Dependent Claim
239 words
A drum and cover therefor comprising: a drum body portion of plastic composition having a cylindrical neck extending axially parallel to the axis of the drum, a drawn-in portion adjacent the top of the neck forming an annular bulged-in bead of smaller diameter than the neck, a plurality of bulge-like projections disposed circumferentially about tHe neck, each of said bulge-like projections having a lower surface slanting away from the outer cylindrical surface of the neck; closure means for said drum comprising a cover having an outer cylindrical portion adapted to fit tightly over the neck of drum, said outer cylindrical portion having cut out sections adapted to fit snugly over the bulge-like projections on the neck of the drum, an inner cylindrical portion coaxial with and of smaller diameter than the outer cylindrical portion, said two portions being connected to form an external rim and an inner annular groove, a lip-like reinforcement on the underside of said inner portion providing a bearing surface for the bead on the neck of the drum, and outwardly projecting reinforcements on the lower edges of the segments of the cover between the bulge-like projections on the neck of the drum, each of said reinforcements having a surface slanting away from the outer cylindrical surface of the cover; sealing means in the bottom of the aforementioned annular groove; and resilient locking means encircling the cover for securing said cover to the neck of drum.
Claim 3
Dependent Claim
49 words
A drum and cover according to claim 1 wherein said cover has a recessed bottom, said lip-like reinforcement extends downwardly from said bottom, and said lip-like reinforcement is bent at right angles inwardly in relation to the rim which surrounds the recessed bottom thereby narrowing the aforementioned annular groove.
Claim 4
Dependent Claim
34 words
A drum and cover according to claim 1 wherein the lower surface of each bulge-like projection on the neck of the drum defines an obtuse angle with the outer cylindrical surface of the neck.
Claim 5
Dependent Claim
26 words
A drum and cover according to claim 1 wherein the lower surface of each bulge-like projection bulging on the neck of the drum is slightly convex.
Claim 6
Dependent Claim
36 words
A drum and cover according to claim 1 wherein the upper surface of each reinforcing projection on the cover forms a ledge-like surface which defines an obtuse angle with the outer cylindrical surface of the cover.
Claim 7
Dependent Claim
24 words
A drum and cover according to claim 1 characterized in that the upper surface of each reinforcing projection on the cover is slightly convex.
Claim 8
Dependent Claim
38 words
A drum and cover according to claim 1 wherein the lower surfaces of the bulge-like projections on the neck of the drum and the upper surfaces of adjacent reinforcing projections on the cover together define an acute angle.
Claim 9
Dependent Claim
74 words
A drum and cover according to claim 1 wherein the resilient locking means comprises a circumferential, resilient locking ring disposed in the angle defined by the slanting lower surfaces of the bulge-like projections on the neck of the drum and the adjacent slanting upper surfaces of the reinforcing projections on the cover, said locking ring alternately and sequentially engaging said slanting surfaces to draw the cover down tightly over the neck of the drum.
Claim 10
Dependent Claim
23 words
A drum and cover according to claim 1 wherein the sealing means in the bottom of the annular groove comprises a resilient gasket.
Claim 11
Dependent Claim
20 words
A drum and cover according to claim 8 wherein the locking ring comprises a spring having a round cross section.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |