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Pipe coupling for female screw

  • US 6,398,268 B1
  • Filed: 07/07/2000
  • Issued: 06/04/2002
  • Est. Priority Date: 03/04/1999
  • Status: Active Grant
First Claim
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1. A pipe coupling for a female screw to be connected to a female screw port formed in a fluid device, comprising:

  • a cylindrical pipe coupling main body;

    a plurality of arm members contained in the pipe coupling main body and radially displaceable with respect to the pipe coupling main body, each of the arm members having a male screw portion provided on a distal end portion thereof and to be connected to the female screw port, the distal end portion projecting from an end of the pipe coupling main body to an outside thereof;

    a sliding member forward and backward slidably inserted in the pipe coupling main body, the sliding member shifting, by forward and backward movement thereof, the arm members between a closed position in which distal ends of the arm members contact each other, and an open position in which the distal ends of the arm members are separated from each other and the male screw portions of the distal end portions of the arm members can be engaged with the female screw port of the fluid device;

    a fluid passage formed in one of the sliding member and the pipe coupling main body and to be connected to a fluid passage formed in the fluid device when the male screw portions engage with the female screw port;

    a lock member provided in the pipe coupling main body for stopping movement of the sliding member such that the arm members are kept in the open position;

    a seal holder provided at an end of the pipe coupling main body and arranged to move forward and backward between an inner peripheral surface of the pipe coupling main body and outer peripheral surfaces of the arm members;

    a spring seat fitted on outer peripheral surface of the arm members such that it can move forward and backward;

    a spring interposed between the spring seat and the seal holder and urging the spring seat and the seal holder away from each other;

    a seal member provided on the seal holder and to be pressed against around the female screw port of the fluid device by an urging force of the spring to seal the female screw port; and

    a pressing member provided on the sliding member and to be brought into contact with the spring seat when the sliding member is moved in a direction in which the arm members are opened, thereby moving the spring seat so as to increase the urging force of the spring.

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