Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1988-01-04
1989-02-07
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335279, 335281, H01F 708
Patent
active
RE0328600
ABSTRACT:
A proportional solenoid has a fixed pole piece 39 and a movable armature 45, both fitted into the bore 52 of a guide tube 36 that provides the required concentricity between the fixed and movable pole pieces 39 and 45. One of the pole pieces has a cylindrical recess 56 and the other pole piece has a reduced diameter cylindrical nose 62 that is complementary to cylindrical recess 56. A radially inwardly facing frusto-conical surface 95 is formed in cylindrical nose 62 to be disposed within recess 56 of the other pole piece and provide a frustoconical pole piece section producing a linear forcestroke curve.
REFERENCES:
patent: 3168242 (1965-02-01), Diener
patent: 3510814 (1970-05-01), Nordfors
patent: 3633139 (1972-01-01), Thompson
patent: 3735302 (1973-05-01), Eckert
patent: 3870931 (1975-03-01), Myers
patent: 3900822 (1975-08-01), Hardwick et al.
patent: 3987385 (1976-10-01), Diller et al.
patent: 4282501 (1981-08-01), Myers
"Cove Tube & Parts", No. 819,714, 7/82, Vickers, Inc., Troy, Michigan, Copy in 335/261.
G. W. Lisk Company, Inc.
Harris George
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