Solenoid apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 24, 1981
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 improved solenoid apparatus for operating valves such as hydraulic/air valves or other mechanical devices including a pressure proof tube which is wholly or partially nonmagnetic and has one end connected sealingly to a stationary core, an armature slidably mounted in contact with the inner face of the pressure proof tube, and a coil assembly comprising substantially a yoke and a coil encompassing the pressure proof tube. A cylindrical magnetic ring enclosing a part of the stationary core and a part of the pressure proof tube in the vicinity of the end face at the attracting side of the stationary core is inserted between the stationary core and the coil assembly the one end of the magnetic ring protruding axially over to the armature side, whereby the solenoid can be used either with alternating or direct current merely by replacing the coil assembly. When the solenoid is connected to an AC power source, there is no need to install a shading coil and therefore, the apparatus is low in cost and reliably endures impact loads.
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