Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1999-08-13
2000-08-29
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
2922515, H01F 202
Patent
active
061114928
ABSTRACT:
A magnet set forth used is in a drain plug. A drain plug is assembled with an attached holder securing an inserted cylindrical magnet. The drain plug is formed of non ferrous material such as brass, aluminum, stainless steel, etc. It is constructed in accordance with industry standards to fit as a replacement device in oil drain pans, and is non ferrous material. It incorporates an extending threaded shaft. The holder is constructed with an axial passage there through having threads at the small end for threading through the drain plug. The passage extends fully through the device, interrupted by a transverse internal registration shoulder at the middle, and defines an extending skirt fitting loosely around an elongate cylindrical rare earth magnet. Also, a dipstick mounted version for small engines is shown and places the magnet on the dipstick in a magnet holder.
REFERENCES:
patent: 2755932 (1956-07-01), Cohn
patent: 4763092 (1988-08-01), Tomita
patent: 5420557 (1995-05-01), Chern
patent: 5465078 (1995-11-01), Jones, Jr.
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