Electric lamp or space discharge component or device manufacturi – Process – Spark plug or spark gap making
Patent
1981-02-09
1986-03-11
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
Spark plug or spark gap making
72258, 313141, 445 49, H01T 2102
Patent
active
045753431
ABSTRACT:
A method of producing bimetal electrodes is disclosed in which a core of one metal is positioned within a cup of another metal so that the core is recessed back from the open end of the cup. In two embodiments, where the core is fully encapsulated, the open end of the cup is initially bottled or bent inward and subsequently the assembly is pressed through an extrusion die with a tool having a nose with an area substantially equal to the area of the core. In one such embodiment, a weld lug is produced by said tool during the extrusion. Such tool completes the closing of the open end of the cup to fully encapsulate the core and applies the principal extrusion force through the closed end to the core and from the core to the forward end or originally closed end of the cup. Subsequently, the extruded part is trimmed and additionally worked as required. In another embodiment, similar tooling is provided to produce an electrode in which the core is not fully encapsulated. In such embodiment, the cup is not bottled prior to the extrusion operation.
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patent: 3857145 (1974-12-01), Yamaguchi et al.
Kin Nelson I.
Payne George T.
Ramsey Kenneth J.
The National Machinery Company
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