| 摘要 |
PCT No. PCT/JP96/03654 Sec. 371 Date Nov. 2, 1998 Sec. 102(e) Date Nov. 2, 1998 PCT Filed Dec. 13, 1996 PCT Pub. No. WO97/24744 PCT Pub. Date Oct. 7, 1997An easily assembled, low cost pressure switch for a hydraulic pump is proposed. An oil pressure introducing hole is provided for leading a discharge pressure to a depression formed in a body which is earthed. A plug supporting an electrically conducting terminal in an insulated state so as to block the depression, comprises a cylindrical part opening into the depression of the body. An electrically conducting sleeve which is pierced by a damping orifice connected to the oil pressure introducing hole, engages with an opening of the cylindrical part. An electrically conducting plunger which comes in contact with and separates from the terminal in response to an oil pressure from the damping orifice, is housed in the sleeve. A spring pushing the plunger against the oil pressure is housed in the cylindrical part of the plug, and the lower end of the sleeve engages with the opening of the oil pressure introducing hole.
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