Metal working – Method of mechanical manufacture – Electrical device making
Patent
1978-08-04
1980-12-23
Crane, Daniel C.
Metal working
Method of mechanical manufacture
Electrical device making
29507, 429174, 220 66, H01M 204
Patent
active
042401976
ABSTRACT:
A sealed primary cell includes a metal receptacle (1), a metal cover (2) which closes the receptacle and a hard and resilient thermoplastic sealing ring (3) which may optionally be coated with a softer material (not shown). The sealing ring (3) is inserted between the cover (2) and the internal wall of the receptacle (1) and is radially compressed between the cover (2) and the receptacle (1). The invention is characterized in that the radial compression of the sealing ring (3) is achieved by radially outward deformation of the outer edge of the cover, e.g. by an auricular portion of a tool (7) enlarging a U-shaped peripheral rim of the cover. FIG. 2 shows the cell held in a die (9) after the sealing ring (3) has been radially compressed by the tool (7) but before the cell is finished by the usual inward crimping of the upper rim of the receptacle (1).
REFERENCES:
patent: 1921021 (1933-08-01), Bungay
patent: 1976673 (1934-10-01), Titus
patent: 2664609 (1954-01-01), Kellems
patent: 2683559 (1954-07-01), Staller
patent: 2905124 (1959-09-01), Henchert
patent: 3068313 (1962-12-01), Daley
patent: 3069489 (1962-12-01), Carmichael et al.
patent: 3343996 (1967-09-01), Micksch et al.
patent: 3671060 (1972-06-01), Kyburz
patent: 3757717 (1973-09-01), Bennett
patent: 3791873 (1974-02-01), Angelovich
patent: 4100869 (1978-07-01), Gross
Crane Daniel C.
Saft-Societe des Accumulateurs Fixes et de Traction
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