Pipe coupling

• US 5,022,687 A
• Filed: 09/18/1989
• Issued: 06/11/1991
• Est. Priority Date: 09/18/1989
• Status: Expired due to Fees

• Current Assignee: Yokohama Aeroquip Company
• Original Assignee: Yokohama Aeroquip Company
• Inventors: Ariga, Toshiki
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US07/408,244
• Time in Patent Office: 631 Days
• Field of Search: 285/321, 285/322, 285/323, 285/307, 285/347
• US Class Current: 285/321
• CPC Class Codes: F16L 37/0927 the wedge element being axially displaceable for releasing the coupling

Abstract

A female coupling member of a pipe coupling is provided with a cap-like retainer removably mounted thereon and having an inner tapered surface. A male coupling member includes a cylindrical portion inserted into an axial bore in the female coupling member and a split elastic cotter ring retained on the cylindrical portion. When the male coupling member is pulled back, the cotter ring is brought into engagement with the tapered surface of the cap-like retainer to couple the coupling members to each other.

Claims

1. A pipe coupling comprising:

a female coupling member having an inner end face and including an axial bore extending therethrough, the axial bore having an enlarged bore portion extending axially from the inner end face of the female coupling member and having an inner tapered surface adjacent to the end face,

a cap-like retainer removably mounted on the female coupling member and having an inner tapered converging surface and an end face,

an elastic split cotter ring disposed within a space defined by the inner tapered surface of the cap-like retainer and having an outer tapered surface complementary to a portion of the inner tapered surface of the retainer, and

a male coupling member including a cylindrical portion complementary to and adapted to fit into the enlarged bore portion of the female coupling member, the cylindrical portion having an enlarged diameter portion, an outer tapered surface on the cylindrical portion of the male coupling member and complementary to the inner tapered surface of the enlarged bore portion for engaging and expanding the cotter ring when the cylindrical portion of the male coupling member is inserted through the cap-like retainer into the enlarged bore portion of the female coupling member, and an annular groove having a bottom surface formed in the enlarged diameter portion adjacent the outer tapered surface for receiving the cotter ring when it rides past the outer tapered surface, the cotter ring being moved relative to the cap-like retainer so as to bring its outer tapered surface into tight engagement with the inner tapered surface of the cap-like retainer so that said cotter ring is wedged between said bottom surface of said groove and said inner tapered surface when the male coupling member is pulled back.

2. A pipe coupling as set forth in claim 1, and further comprising an expansible retaining ring positioned within the space in the cap-like retainer in a juxtaposed relationship with the cotter ring, wherein, upon the insertion of the male coupling member into the female coupling member, the retaining ring is fitted into the groove in the enlarged diameter portion of the male coupling member in the same manner as the cotter ring, the combined axial width of said cotter ring and said retainer ring being substantially equal to the axial width of said annular groove, and the retaining ring is moved out of the opening of the cap-like member when pulling back the male coupling member and engages said end face, thereby preventing any axial movement of the male coupling member relative to the female coupling member.