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Continous real time safety-related control system

  • US 5,880,954 A
  • Filed: 12/04/1995
  • Issued: 03/09/1999
  • Est. Priority Date: 12/04/1995
  • Status: Expired due to Fees
First Claim
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1. A control system for detecting and initiating cessation of hazardous machinery, said system comprising:

  • a. detecting means for sensing an intrusion of an object into a hazard zone of machinery;

    b. means for initiating a stop of motion of said machinery within a fixed response time;

    c. temporal monitoring means to monitor an elapsed time between detection of said intrusion into said hazard zone and a change of state of at least one interposing device within a stop sequence of said machinery, wherein the at least one interposing device is designed to effect stopping of said machinery;

    d. machinery-interface means for connecting said system to said machinery; and

    e. a controller for controlling said detecting means, said means for initiating said stop motion, said temporal monitoring means, and said machinery-interface means, wherein said controller is designed to control said means for initiating said stop motion in conjunction with said temporal monitoring means so as to determine that said change of state of said one or more interposing devices occurs within said fixed response time in order to stop motion of said machinery within a desired period of time.

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