Metal working – Method of mechanical manufacture – Electrical device making
Patent
1984-12-20
1986-08-12
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
1791155R, 1791155ES, 1791155PV, 179181R, 181173, 264287, 425303, 425396, H04R 3100
Patent
active
046047921
ABSTRACT:
The method of making the diaphragm includes pressing on the front face of a film at spaced apart areas to deform it progressively into a series of closely-spaced generally U-shaped projections. A manufacturing device presses the sides of the projections inwardly to rigidify them. The transducer magnet assembly includes a series of elongated magnet pole-piece strips which confine magnets and are arranged in parallel spaced-apart rows with the ends thereof fitted into transverse elongated grooves extending within a pair of elongated cross-piece end members. The driver is fixed together in a precise manner by flowing an adhesive material into the grooves, and then by allowing such material to harden.
REFERENCES:
patent: 2624390 (1953-01-01), Groat
patent: 3171904 (1965-03-01), Poutot
patent: 3290205 (1966-12-01), Goldstein et al.
patent: 3575768 (1971-04-01), Hannum
patent: 3682747 (1972-08-01), Munters
patent: 4037061 (1977-07-01), von Reckinghausen
patent: 4227952 (1980-10-01), Sabee
patent: 4251311 (1981-02-01), Lemelson
patent: 4276449 (1981-06-01), Sawafujl
Hall Carl E.
Kleinke Bernard L.
LFF & Associates
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