Mechanical pipe coupling with toothed retainer

A coupling for sealingly engaging a pipe end, said coupling comprising:

• a first receptacle for receiving said pipe end;
• a second receptacle arranged coaxially and in tandem with said first receptacle, said second receptacle being smaller than said first receptacle so as to form a shoulder within said coupling between said first and second receptacles;
• a retainer having a cylindrical surface for positioning within and coaxial with said first receptacle, said retainer comprising:
• a first plurality of locking teeth positioned circumferentially around and being resiliently biased radially inwardly from said perimetrical surface, said first plurality of teeth each having an edge facing obliquely toward said shoulder and engageable with said pipe end, said first plurality of teeth deflecting resiliently radially outwardly to allow insertion of said pipe end coaxially into said coupling, said edges being resiliently biased into engagement with said pipe to resist relative movement between said pipe and said coupling in a direction away from said shoulder;
• a second plurality of locking teeth positioned circumferentially around said perimetrical surface, said second plurality of teeth each having an edge facing away from said shoulder and resiliently biased outwardly from said perimetrical surface for engagement with said first receptacle to resist relative movement between said retainer and said coupling in a direction away from said shoulder;
• and
• an elastomeric seal positioned coaxially within said first receptacle between said shoulder and said retainer and effecting a fluid-tight seal between said pipe end and said first receptacle.

A coupling for sealingly engaging a pipe end, said coupling comprising:

• a first receptacle for receiving said pipe end;
• a second receptacle arranged coaxially and in tandem with said first receptacle, said second receptacle being smaller than said first receptacle so as to form a shoulder within said coupling between said first and second receptacles;
• a retainer having a perimetrical surface for positioning within and coaxial with said first receptacle, said retainer having locking teeth positioned circumferentially around and projecting from said perimetrical surface, each of said locking teeth having a first edge facing obliquely toward said shoulder and a second edge positioned opposite thereto, each of said locking teeth being resiliently angularly biased for positioning said first edges radially inwardly of said perimetrical surface and said second edges radially outwardly thereof, said first edges being engageable with said pipe end to resist relative motion between said pipe end and said retainer in a direction away from said shoulder, said second edges being engageable with said first receptacle resisting relative motion between said retainer and said first receptacle in a direction away from said shoulder, said pipe end being insertable under said first edges in a direction toward said shoulder for insertion into said fitting;
• and
• an elastomeric seal positioned coaxially within said first receptacle between said shoulder and said retainer and effecting a fluid-tight seal between said pipe end and said first receptacle.