Solenoid
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 11, 1983
Grant Date -
N/A
app pub date -
Oct 23, 1979
filing date -
Oct 26, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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