Ferrofluid-pole-piece-magnet apparatus

Details Ferrofluid-pole-piece-magnet apparatus Ferrofluid-pole-piece-magnet apparatus

1983-05-25

1984-12-25

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277234, F16J 1540

Patent

active

044899505

ABSTRACT:
Pole-piece-magnet apparatus for use as single- or double-pole-piece ferrofluid seal apparatus and method of manufacture, which pole-piece-magnet apparatus comprises at least one washer-type metal-pole-piece element with one flat surface having a plurality of spaced-apart raised dimple elements thereon with outwardly extending anchoring surfaces; and a washer-like hard molded permanent magnet polymer ring element molded about and secured directly to the one flat surface of the pole-piece element by the anchoring surface on the raised dimples, the permanent magnet ring element having an inner diameter greater than the inner diameter of the pole-piece element and an outer diameter of about the same dimensions as the outer diameter of the pole-piece element.

REFERENCES:
patent: 3740060 (1973-06-01), Miskolczy et al.
patent: 3756279 (1973-09-01), Widmaier
patent: 3788650 (1974-01-01), Place
patent: 4240228 (1980-12-01), Okamura
patent: 4252328 (1981-02-01), Raj et al.
patent: 4357021 (1982-11-01), Raj et al.
patent: 4406467 (1983-09-01), Burger et al.

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