| 摘要 |
PURPOSE: A pressure switch is provided to prevent an oil leakage by preventing the generation of a minute interval in the maximum stroke of a piston. CONSTITUTION: A pressure switch comprises a housing, a micro switch(121), a piston(130), and an oil leakage prevention unit. The housing is comprised of an upper housing(111) and a lower housing(112). The micro switch is arranged inside the housing and is connected to an external circuit. The piston reciprocates by an elastic bias unit. The piston selectively contacts the micro switch. An oil leakage is arranged inside the housing. The oil leakage prevention unit prevents the oil leakage when the piston reciprocates.
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