Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1992-04-06
1993-05-04
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335255, H01F 300, H01F 708
Patent
active
052085708
ABSTRACT:
An assembly is provided for use in a solenoid having an energizable coil. The apparatus includes a ferromagnetic main body member adapted to be received in the coil. An armature chamber having a constant diameter is disposed in the main body member. A radially externally facing taper is formed in the outer surface of the main body member. The taper extends between the armature chamber and the outer surface of the main body member. A stationary pole piece and an end plug respectively define a first and second end of the armature chamber. An armature member is positioned in the armature chamber for axial sliding movement relative to and defining a working gap relative to the pole piece. The armature includes a fluid passage adapted to provide nonlaminar fluid flow. A nonferromagnetic sleeve is positioned on and fixedly connected to the main body member. The sleeve is linearly coextensive with the externally facing taper and at least a portion of the working gap sufficient to permit selected magnetic forces to be exerted on the armature member. A junction of the sleeve and the externally facing taper define an air gap which extends from the externally facing taper to an internal radial surface. The stationary pole piece and the main body member are manufactured from a single piece of ferromagnetic material and the armature chamber is formed subsequent to fixing the sleeve to the main body member.
REFERENCES:
patent: Re32783 (1988-11-01), Clark
patent: Re32860 (1989-02-01), Clark
patent: 4539542 (1985-09-01), Clark
patent: 4604600 (1986-08-01), Clark
patent: 5050840 (1991-09-01), Kondo et al.
Broome Harold
Caterpillar Inc.
Hickman Alan J.
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