发明授权
- 专利标题： Safety device for a tool powered by an electric motor
- 专利标题（中）： 由电动机驱动的工具的安全装置
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申请号： US86190申请日： 1987-08-12
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公开(公告)号： US4847721A公开(公告)日： 1989-07-11
- 发明人: Michael Nothofer , Malcolm J. Bishop , Nigel Bleasdale
- 申请人： Michael Nothofer , Malcolm J. Bishop , Nigel Bleasdale
- 申请人地址： DEX Stuttgart
- 专利权人： C. & E. Fein GmbH & Co.
- 当前专利权人： C. & E. Fein GmbH & Co.
- 当前专利权人地址： DEX Stuttgart
- 优先权： DEX3504074 19850207
- 主分类号： B24B23/00
- IPC分类号： B24B23/00 ; H02H7/093
摘要：
A safety device for a tool powered by an electric motor. It has a main switch, electronic controls, and a tachometer-generator. In order to provide a device for switching off a motor as a function of motor speed that is simple and economical and that will retain the same nominal switch-off value for the total life of the device, a relay is wired in parallel with the motor and controls the supply of power to the motor through a relay contact.
公开/授权文献
- USD421438S Loudspeaker box 公开/授权日：2000-03-07