Metal working – Method of mechanical manufacture – Electrical device making
Patent
1984-08-16
1986-12-23
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29742, 29760, 29785, 29792, H04R 3100
Patent
active
046303588
ABSTRACT:
A moving coil capsule for a telephone handset is designed for high speed mass production. It consists of a carrier ring (1) and diaphragm (2) formed as an interim sub-assembly in a first buffer store. A coil (6) preparation and finishing stage applies the coil (6) on a former in the form of an aluminium dome (5) and inserts the dome (5) into a nest (7) in the diaphragm to form a first sub-assembly in a second buffer store. A magnet assembly (10, 11 and 12) is manufactured using quick curing glue with the outer pole piece (12) formed by an accurate stamping whose outer rim fits precisely in a reference datum (1a) in the carrier ring.
The interim sub-assemblies and magnet assemblies are made one at a time, and the first sub-assemblies are formed two at a time from the interim sub-assemblies, but at half the speed.
Final assembly of the magnet assembly and first sub-assembly together with a rear cover (14) is carried out and a throughput at a rate of one capsule in less than four seconds can be achieved.
REFERENCES:
patent: 3553815 (1971-01-01), McElvy
patent: 4173824 (1979-11-01), Wolfthal
patent: 4566178 (1986-01-01), Hecht et al.
Burton Trevor
Taylor Frank
Hall Carl E.
Standard Telephones and Cables Public Limited Company
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