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

• Current Assignee: Nitto Kohki Company Limited
• Original Assignee: Nitto Kohki Company Limited
• Inventors: Kobayashi, Yoshikazu, Sasa, Takeya, Makishima, Reichi, Kotake, Naoyuki
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US07/986,541
• Time in Patent Office: 344 Days
• Field of Search: 285/308, 285/319, 285/320, 285/318, 285/903, 285/322
• US Class Current: 285/308
• CPC Class Codes: F16L 25/0045 of the quick-acting type
• CPC Class Codes: F16L 33/24 with parts screwed directly on or into the hose F16L33/22 takes precedence
• CPC Class Codes: Y10S 285/903 Corrugated

Abstract

A joint for connecting a corrugated pipe to another member includes a cylindrical body having an annular step portion formed in its inner part and adapted to be brought into contact with a front end of a corrugated pipe; a chuck having an annular body which includes a forward end part of an inner diameter substantially equal to or slightly smaller than an outer diameter of the corrugated pipe and which exhibits elasticity by which the chuck can contract and expand in radially inner and outer directions, an engaging portion formed on an inner periphery of its forward end part for engaging an outer periphery of the corrugated pipe, and a locking portion formed on an inner periphery of its rearward end part, the chuck being engaged with the outer periphery of the corrugated pipe in the cylindrical body so as to be capable of moving the corrugated pipe into the cylindrical body integrally with the chuck; and a push cylinder having a counterpart locking portion formed on an outer periphery of its forward end part and adapted to be locked to the locking portion formed on the rearward end part of the chuck, the push cylinder being slidably fitted to an inner periphery of an end portion of the cylindrical body, the push cylinder being for pushing the chuck into the cylindrical body when the push cylinder is advanced.

Claims

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.