Electric robot for use in a hazardous location

  • US 4,984,745 A
  • Filed: 06/20/1989
  • Issued: 01/15/1991
  • Est. Priority Date: 01/22/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. An electrically driven robot adapted for use in a hazardous environment, comprising:

  • a base having a first hollow-base section and also having a second hollow-base section mounted for rotational movement on the first base section, and a circular seal that extends between the first and second base sections to cooperate therewith in defining an airtight first compartment;

    a first drive mechanism including at least one electric motor received within the airtight first compartment;

    an arm assembly including an inner arm mounted for movement on the base and an outer arm mounted for movement on the inner arm, said arm assembly being driven by the first drive mechanism to move the inner and outer arms, and one of said arms of the arm assembly having an airtight second compartment fluidly communicated with the airtight first compartment of the base;

    a second drive mechanism including at least one electric motor within the second compartment defined by the arm assembly;

    a wrist mechanism mounted on the outer arm of the arm assembly and driven by the second drive mechanism;

    a cable bundle extending to the first hollow-base section and into the airtight first compartment of the base and having at least one cable connected to the first drive mechanism to operate the electric motor thereof, and said cable bundle including at least one other cable that extends through the circular seal of the base and from the airtight first compartment of the base into the airtight second compartment of the arm assembly and being connected to the second drive mechanism to operate the electric motor thereof;

    a pressurized gas supply that feeds pressurized gas into the airtight first compartment of the base and thence into the airtight second compartment of the arm assembly to provide pressurized gas that surrounds the electric motors and the cables of the cable bundle within the compartments, whereby the robot is capable of operating in the hazardous environment; and

    communicating means for fluidly communicating the first and second compartments, said pressurized gas supply feeding pressurized gas through said communicating means and into the second compartment.

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