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Injury protection device for machinery

  • US 4,075,961 A
  • Filed: 05/07/1976
  • Issued: 02/28/1978
  • Est. Priority Date: 05/07/1976
  • Status: Expired due to Term
First Claim
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1. A system for producing a control signal to stop operation in response to intrusion of a human body part into a given machine area comprising:

  • means for detecting presence of a human part in said area and producing a first signal in response to intrusion of said part and a second signal in response to removal of said part,means for producing a disable signal in response to said first signal which prevents operation of said machine until said second signal is produced,means for producing an enable signal in response to said second signal for a predetermined time following production of said second signal to permit operation of said machine during said predetermined time and preventing operation thereafter, andmeans connected to said disable signal producing means for causing said machine to stop in response to said disable signal and connected to said enable signal producing means for causing said machine to stop in response to the absence of said enable signal.

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