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Safety device for electromechanical opening and closing mechanism

  • US 4,561,691 A
  • Filed: 09/30/1983
  • Issued: 12/31/1985
  • Est. Priority Date: 09/28/1983
  • Status: Expired due to Fees
First Claim
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1. A safety device for an electromechanical opening and closing mechanism with a mobile member, comprising:

  • driving means for driving said mobile member,load signal detecting means connected to said driving means for detecting a load applied to said driving means and for producing a load signal corresponding thereto,set signal generating means connected to said load signal detecting means for generating set signals as criteria for judging abnormal loads, anddrive control means connected to said load signal detecting means and said set signal generating means for comparing the load signal from said load signal detecting means with set signals from said set signal generating means and controlling said driving means in accordance with the result of said comparison;

    said set signal generating means comprising,first set signal generating means for generating a first set signal which is higher than said load signal by a predetermined level and follows said load signal after delay of a predetermined time period,second set signal generating means for generating a second set signal with a level determined by predetermined positions of said mobile member,said drive control means including means for applying to said driving part a stop signal when the level of said load signal exceeds either of said first set signal and said second set signal.

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