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Electronic overspeed switch

  • US 4,510,899 A
  • Filed: 05/01/1984
  • Issued: 04/16/1985
  • Est. Priority Date: 09/17/1979
  • Status: Expired due to Fees
First Claim
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1. An electrical speed control system for selectively connecting an accessory to an engine having a rotating electric signal producing device and a rotating shaft, said speed control system comprising:

  • means connected to receive a signal from said signal producing device for producing a speed signal indicative of the rotational speed of said shaft;

    signal level sensing means connected to receive said speed signal for determining if said speed signal is indicative of a speed below a preselected first level and if said speed signal is indicative of a speed above a preselected second level, and for producing an energization signal whenever said speed signal is below said first preselected threshold level, for interrupting said energizing signal when said speed signal is above said second level for maintaining said interruption of said energization signal until said speed signal falls below said first preselected level and for reestablishing said energizing signal when said speed signal again falls below said first preselected level; and

    switch means connected to said accessory means, and a source of electrical power, said energization signal actuating said switch whenever said energization signal is present.

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