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Emergency system for stopping a band blade of a cutting apparatus

  • US 4,117,752 A
  • Filed: 04/15/1977
  • Issued: 10/03/1978
  • Est. Priority Date: 05/25/1976
  • Status: Expired due to Term
First Claim
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1. In a cutting apparatus having pulleys rotatably mounted on a base which is in turn mounted on a support and the pulleys driving a band blade reeved therearound by means of a motor driving one of the pulleys and a power supply for said apparatus, an emergency system for stopping the band blade comprising an amplifier having an input in direct electric contact with the band blade, first relay means electrically coupled to the amplifier, said first relay means being electrically coupled between the power supply and the motor and operated for disconnecting said power supply and said motor when the amplifier receives and amplifies the electric charge potential of a human body only when the body contacts said blade, an electrically actuated brake mounted on said support and engagable with the driven pulley for braking the pulley, a further electrically actuated brake mounted on said base and engagable with said band blade for braking the band blade, and second relay means electrically coupled to the amplifier and electrically coupled between said power supply and said brakes and actuated to electrically connect said power supply and said brakes when the amplifier receives and amplifies the electric charge potential of a human body when the body contacts the blade.

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