Magnetic drain plug

Details Magnetic drain plug Magnetic drain plug

1993-03-15

1995-05-30

Luong, Vinh T.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

184 625, H01F 702

Patent

active

054205573

ABSTRACT:
A magnetic drain plug comprises a resilient plastic plug member and a permanent magnet disposed therein. The plug member has a threaded upper section, a medial flange, and a lower head section with engagement surfaces for a hand tool such as a wrench. An axial bore formed through the plug member defines a tapered upper channel, a medial chamber, and a lower aperture therein. The chamber has a section larger than that of the adjoining channel or aperture. The magnet is forcibly inserted through the upper channel, which is in communication with the interior of a lubricating housing when the plug is mounted therein, so as to snap fit into the conformingly shaped chamber. The lower aperture brings the magnet into communication with ambient air to assist cooling.

REFERENCES:
patent: Re20291 (1937-03-01), Bock
patent: 2242830 (1941-05-01), Lisle
patent: 2345029 (1944-03-01), Brooks
patent: 2450630 (1948-10-01), Bourne
patent: 2755932 (1956-07-01), Cohn
patent: 2878342 (1959-03-01), Arthur
patent: 2910632 (1959-10-01), Spodig
patent: 2983385 (1961-05-01), Botstiber
patent: 4810148 (1989-03-01), Aisa et al.
patent: 4851116 (1989-07-01), Tomita
patent: 4940207 (1990-07-01), Katsuyama

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