Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-02-28
1992-05-19
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29447, 219422, 392480, 425545, 425549, H05B 300
Patent
active
051135760
ABSTRACT:
A process for the production of an injection nozzle comprising an essentially tubular inner part (16) and at least one essentially wire-type heating element (14, 15) which is embedded entirely inside a solid metal body (12, 13) lying in a close-fitting manner around the inner part in which one or more separate, essentially tubular metal bodies (12, 13) with a heating element (14, 15) embedded therein are formed by placing the heating element and the metal in a molten state in a mold, so that the heating element is completely enclosed by the molten metal, and subsequently allowing the metal to set, following which the body thus formed is removed from the mold and this tubular body or these tubular bodies thus obtained is or are then slid over the tubular inner part up to a certain point. Advantageously, a fully open axially running slit (12', 13') is formed in the wall of the tubular body (12, 13), while the wire-type heating element (14, 15) extends in curved loops running zigzag through the body and extending to the slit.
REFERENCES:
patent: 2464908 (1949-03-01), Volkmann
patent: 4268241 (1981-05-01), Rees et al.
patent: 4478780 (1984-10-01), Kim
patent: 4558210 (1985-12-01), Leary
patent: 4649262 (1987-03-01), Yoshikawa
patent: 4955804 (1990-09-01), Martell et al.
"Standardisiertes Schmelzeleitsystem fur Grosswerkzeuge", Plastverarbeiter, vol. 38, No. 12, Dec., 1987, by R. Lohl, pp. 106-116.
van Boekel Franciscus A. J.
Van Den Brink Anthonie
Echols P. W.
Eurotool B.V.
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