Patent US3754997A successfully refreshed from Google Patents.
US3754997A
Expired / Lapsed
US
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Electric battery cell with a plastic top having a spring pressure seal
Assignee: Duracell Inc USA
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Filing: 1971-06-16
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Granted: 1973-08-28
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Expires: 1991-06-16
Abstract
Abstract An electric cell with a plastic top closure as a circular disc that has a peripheral co-axial and concentric plastic border ring with a pre-stressed convoluted metal spring ring disposed within the plastic ring to establish permanent radially outward pressure against the plastic border ring, which is crimped over the metal ring by the crimped end of the container can. The spring convolution serves additionally as a rigid backing element for an additional pressure force on the plastic border ring, to prevent or limit unsealing effects that could arise from cold flow and creepage of the plastic ring.
Inventors
- 👤 R Ralston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:08
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/10; H01M50/172; H01M50/174; H01M50/182; H01M6/00; H01M6/04; H01M6/06; H01M6/08; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
205 words
An electric cell, comprising a metallic can closed at the bottom and originally open at the top for insertion of the cell operating components, with said can having an internal peripheral bead formed around the can to serve as an internal seat for a top closure for the can; and a top closure for said can embodying a rigid circular plastic body extending across the full planar space within said seat bead, and said body having an integral resilient flexible compressible plastic ring as an extension of said rigid body and lying against the inner peripheral surface of said can above said bead; and means for applying axial pressure force against said plastic ring in compression on said plastic ring to establish increased pressure sealing action for said cell can, said means for applying pressure forces including a pre-stressed metal spring ring element seated radially against the inner surface of said plastic ring and effective to impress an outward radial pressure in and against said plastic ring in a circular internal peripheral region around and within said plastic ring, above said bead, to maintain a constant pressure seal between said plastic ring and the inside surface of said can where engaged by said plastic ring.
Claim 2
Dependent Claim
205 words
An electric cell, comprising a metallic can closed at the bottom and originally open at the top for insertion of the cell operating components, with said can having an internal peripheral bead formed around the can to serve as an internal seat for a top closure for the can; and a top closure for said can embodying a rigid circular plastic body extending across the full planar space within said seat bead, and said body having an integral resilient flexible compressible plastic ring as an extension of said rigid body and lying against the inner peripheral surface of said can above said bead; and means for applying axial pressure force against said plastic ring in compression on said plastic ring to establish increased pressure sealing action for said cell can, said means for applying pressure forces including a pre-stressed metal spring ring element seated radially against the inner surface of said plastic ring and effective to impress an outward radial pressure in and against said plastic ring in a circular internal peripheral region around and within said plastic ring, above said bead, to maintain a constant pressure seal between said plastic ring and the inside surface of said can where engaged by said plastic ring.
Claim 3
Dependent Claim
192 words
An electric cell, as in claim 1, comprising a cylindrical can as a container, having an inwardly formed peripheral bead to serve as a seat for a top closure, and a free open end cylindrical portion of said can originally extending co-axially upwardly from said seat; a closure top for said can consisting of an annular plastic body having a rigid central hub, a relatively rigid annulus surrounding said hub and terminating in a peripheral ring extending upwardly co-axially and concentrically to fit within said free open cylindrical portion of said can, said peripheral ring being relatively thin to permit and accept relatively simple and easy deformation with said can end portion in an ultimate closing operation during cell manufacture; and wherein said stressed metal spring ring is disposed for peripherally engaging the inner surface of said plastic peripheral ring to press said plastic peripheral ring against said can extension above said seat, and said can extension and plastic peripheral ring being ultimately pressed radially inwardly to be peended over and to compress said metal spring ring, to establish pressure sealing and closure compression on both sIdes of said plastic peripheral ring.
Claim 4
Dependent Claim
72 words
A cell, as in claim 2, in which said annular plastic body extends fully across the transverse diametrical area within said internal seat bead on said can, and embodies a depending portion that fits snugly diametrically within said seat bead; and said spring ring is disposed at a level in said can than enables said spring ring to press said peripheral plastic ring peripherally and downwardly against said bead as a seat.
Claim 5
Dependent Claim
38 words
A cell, as in claim 3, in which said peripheral plastic ring and said can extension are deformed concentrically radially inwardly around the central part of said plastic body progressively along the length of said spring metal ring.
Claim 6
Dependent Claim
38 words
An electric cell, as in claim 2, including, further, an outer cylindrical jacket surrounding the can and insulated therefrom; and means controlled by said jacket to impress a compression force on the peened over end of said can.
Claim 7
Dependent Claim
23 words
An electric dry cell, as in claim 5, in which said jacket controlled means constitutes a peened over end of said jacket cylinder.
Claim 8
Dependent Claim
35 words
An electric cell, as in claim 2, including, further, an annular pressure washer disposed co-axially to seat on the peened-over end extension of said can; and means for impressing an axial pressure on said washer.
Claim 9
Dependent Claim
39 words
An electric cell, as in claim 7, in which a metal cylindrical jacket concentrically surrounds and is insulated from said can; and said jacket is peened over at one end to constitute said axial pressure means for said washer.
Claim 10
Dependent Claim
102 words
An electric cell, as in claim 8, in which an anode electrode of nail shape extends axially down through said hub of said closure into the space within said can to engage related electrode material, and embodies a flat head piece; a circular closure cap having a central co-axial area to seat on said head piece and electrically welded thereto to serve as a surface electrode, said cap having a circular annular border shaped and disposed to seat relatively congruently above the peened-over can end and insulated therefrom, with the peened-over end of said jacket pressing downward on said circular annular border.
Claim 11
Dependent Claim
115 words
An electric battery cell comprising a cylindrical container can having one end originally open to receive the cell components; an insulating closure for said can, said closure being insertable into said open end of said can and extending over substantially the entire internal sectional area of said can when inserted, and having a cylindrical sealing portion engaging the inner peripheral surface of said can over a limited axial length of said can; and a metal ring disposed within said sealing portion for mutually reacting with said can against opposite surfaces of said sealing portion to establish a high-pressure sealing engagement between said sealing portion and the surface of the can engaged by said sealing portion.
Claim 12
Dependent Claim
115 words
An electric battery cell comprising a cylindrical container can having one end originally open to receive the cell components; an insulating closure for said can, said closure being insertable into said open end of said can and extending over substantially the entire internal sectional area of said can when inserted, and having a cylindrical sealing portion engaging the inner peripheral surface of said can over a limited axial length of said can; and a metal ring disposed within said sealing portion for mutually reacting with said can against opposite surfaces of said sealing portion to establish a high-pressure sealing engagement between said sealing portion and the surface of the can engaged by said sealing portion.
Claim 13
Dependent Claim
19 words
An electric cell, as in claim 10, in which said reacting pressure means embodies a resilient spring metal ring.
Claim 14
Dependent Claim
19 words
An electric cell, as in claim 10, in which said reacting pressure means embodies a convoluted spring metal ring.
Claim 15
Dependent Claim
25 words
An electric cell, as in claim 10, in which said reacting pressure means embodies a convoluted spring metal ring having parallel flat opposite side surfaces.
Claim 16
Dependent Claim
26 words
An electric cell, as in claim 12, in which said spring metal ring is in pre-stressed compression to less-than-normal diameter when assembled within said sealing portion.
Claim 17
Dependent Claim
80 words
An electric cell, as in claim 14, in which the edge of the open end of said can is peened over radially inward with the free circular edge of said sealing portion pressed over and onto said metal ring, while said metal ring serves as a rigid backing and is operative after assembly to serve as a permanent reaction pressure element to cooperate with said can in pressing said sealing portion to achieve a tight pressure seal against said can.
Claim 18
Dependent Claim
31 words
An electRic cell, as in claim 10, in which said reaction pressure means co-operate with said can to establish mutual pressures on said sealing portion in radial and in axial directions.
Claim 19
Dependent Claim
30 words
An electric cell, as in claim 1, in which said pressure-applying means serves to compress said plastic ring both against said bead and against the inner surface of said can.
Claim 20
Dependent Claim
112 words
In an electric cell having a metal can container for the components thereof, and a top plastic cover with a concentric resilient plastic cylindrical ring around the border of said plastic cover to seal against the inner surface of said can, the method of providing a high-pressure seal between said resilient ring and said can, which consists in disposing a compressed and pre-stressed reilient metal spring convoluted ring within said plastic cylindrical ring seal during assembly of the cell; and closing said cell with said metal spring ring in place to provide a permanent interior pressure within said plastic ring seal to press towards the can for the life of said cell.
Claim 21
Dependent Claim
112 words
In an electric cell having a metal can container for the components thereof, and a top plastic cover with a concentric resilient plastic cylindrical ring around the border of said plastic cover to seal against the inner surface of said can, the method of providing a high-pressure seal between said resilient ring and said can, which consists in disposing a compressed and pre-stressed reilient metal spring convoluted ring within said plastic cylindrical ring seal during assembly of the cell; and closing said cell with said metal spring ring in place to provide a permanent interior pressure within said plastic ring seal to press towards the can for the life of said cell.
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |