Solenoid

Details Solenoid Solenoid

1979-10-23

1983-01-11

Duggan, Donovan F.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335262, 310 14, 310 30, H01F 708, H02K 3302

Patent

active

043684467

ABSTRACT:
An AC or DC solenoid for operating a hydraulic or air valve, or another machine comprises a means provided at one end of an armature for reducing the effective cross-sectional area of a magnetic path extending through the armature and a yoke when the armature and a stationary core have a distance therebetween which is smaller than a predetermined fraction of the full stroke of movement of the armature. The solenoid is further provided between the armature and the stationary core with a means permitting them to be brought into axially overlapping relation to form a section of leakage flux therebetween. According to another aspect of the invention, there is provided novel means for securing a solenoid of the armature in tube type to a valve body. The improved solenoid has a small size, a long life, and superior performance without causing any excessive attraction over a given small stroke and generating any large noise.

REFERENCES:
patent: 2575095 (1951-11-01), Charbonneau et al.
patent: 3378031 (1968-04-01), Hatashita
patent: 3389355 (1968-06-01), Schroeder, Jr.
patent: 3448307 (1969-06-01), Duriu
patent: 3805099 (1974-04-01), Kelly
patent: 4008448 (1977-02-01), Muggli
patent: 4016965 (1977-04-01), Wirth et al.
patent: 4114125 (1978-09-01), Komatsu
patent: 4290039 (1981-09-01), Tochizawa

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