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Joint for connection of a corrugated pipe

  • US 5,261,707 A
  • Filed: 12/07/1992
  • Issued: 11/16/1993
  • Est. Priority Date: 12/07/1992
  • Status: Expired due to Fees
First Claim
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1. A joint for connecting a corrugated pipe to another member, said joint comprising:

  • a generally cylindrical body including an internal stepped portion defining an annular surface to contact a leading end of a corrugated pipe inserted in the cylindrical body, a chuck coupling portion defining an inner peripheral surface of the cylindrical body in the vicinity of said stepped portion, a holding portion defining an inner peripheral surface of the cylindrical body at an end of the body, a chuck escape portion between said chuck coupling portion and said holding portion, the chuck escape portion defining an inner peripheral surface of the cylindrical body having a diameter larger than that of each said inner peripheral surface defined by said chuck coupling and said chuck holding portions such that the cylindrical body has another inner annular surface of an internal stepped portion located between said chuck escape portion and said holding portion;

    an annular chuck received within said cylindrical body, said chuck exhibiting sufficient elasticity to allow the chuck to be expanded and contracted in radially outward and radially inward directions, and said chuck having a front end, an engagement at an inner periphery of said front end and which engagement is configured to engage an outer peripheral portion of a corrugated pipe inserted within the chuck, a rear end, and a locking part at an inner periphery of said rear end, the front end of said chuck having an outer diameter close to that of the diameter of the surface defined by said chuck coupling portion of the cylindrical body such that the front end of the chuck is prevented from expanding outwardly when located in said chuck coupling portion, and the rear end of said chuck having an outer diameter close to that of the surface defined by said holding portion of the cylindrical body such that the rear end of the chuck is slidable along the surface defined by said holding portion and can expand into said chuck escape portion after having been moved off of the holding portion and into the escape portion; and

    a push cylinder received in said end of the cylindrical body, said push cylinder including a forward end, a counterpart locking portion at an outer periphery of said forward end and which counterpart locking portion is locked to said locking part of the chuck such that axial movement of said push cylinder into said cylindrical body would cause said chuck to be pushed into the cylindrical body, said push cylinder having such a length that the rear end of said chuck is located against said another inner annular surface of the internal stepped portion located between said chuck escape portion and said holding portion of the cylindrical body and said front end of said chuck is positioned in said chuck coupling portion when the push cylinder has been pushed into the cylinder to a complete insertion position wherein the chuck is prevented by engagement of said rear end of said chuck with said another inner annular surface from being retracted from said chuck coupling portion.

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