Magnetically retained polymeric solenoid tip

Details Magnetically retained polymeric solenoid tip Magnetically retained polymeric solenoid tip

1997-12-15

1999-05-18

Gellner, Michael L.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335229, 335253, 335255, 25112915, 25112916, 25112921, H01F7/00

Patent

active

059054239

ABSTRACT:
A permanent magnet armature solenoid has a tip formed of a non-magnetic material operably connected to a ferromagnetic insert which is firmly held to the end of the magnetic armature by the magnetic attraction between the insert and armature. The magnetic field of the armature holds the armature and the insert together as a single unit, even under high acceleration, deceleration and rapid movement of the armature. The insert is relatively small compared to the armature and the addition of the insert to the solenoid does not significantly adversely affect the performance of the solenoid. The insert is preferably formed of a magnetically susceptible metal such as iron, steel or stainless steel. Desirably, the tip is formed of a polymeric material and preferably of an elastomer so that the tip may be molded directly to the insert by conventional molding techniques to facilitate molding the non-magnetic tip onto the insert.

REFERENCES:
patent: 3738578 (1973-06-01), Farrell
patent: 4524797 (1985-06-01), Lungu
patent: 4564046 (1986-01-01), Lungu
patent: 4690371 (1987-09-01), Bosley et al.
patent: 4737750 (1988-04-01), Prouty
patent: 5024247 (1991-06-01), Lembke
patent: 5188336 (1993-02-01), Graner et al.
patent: 5611312 (1997-03-01), Swanson et al.

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