Restrained sleeve pipe coupling

Abstract

A restrained sleeve coupling assembly for interconnecting pipe sections includes a generally cylindrical sleeve body with opposed gasket engaging surfaces adjacent opposite ends of the body for receiving fluid sealing gaskets forcibly engaged with the body and opposed end rings which are sleeved over the respective pipe sections to be joined. The end rings include flanges for engagement with elongated tension bolt assemblies to secure the sleeve body, the gaskets and the end rings in assembly with each other. The end rings also include circumferentially spaced bosses and polygonal shaped gripper members disposed in recesses in the bosses and forcibly engageable with the outer surfaces of the pipe sections over which the end rings are sleeved as determined by limited torque bolt assemblies engageable with the gripper members.

1 . An adaptor bell for coupling two sections of substantially axially aligned pipe having dissimilar outside diameters, comprising: 
 a generally cylindrical body having first and second opposed ends, a gasket engagement surface at the first end and a gasket support surface at the second end, a first cylindrical sleeve section adjacent the first end and a second cylindrical sleeve section adjacent the second end, wherein the second cylindrical sleeve section has a smaller diameter than the first cylindrical sleeve section, and a shoulder between the first cylindrical sleeve section and the second cylindrical sleeve section.    
   
   
       2 . The adaptor bell set forth in  claim 1  wherein: 
 the gasket engagement surface at the first end of the generally cylindrical body comprises a somewhat frustoconical surface.    
   
   
       3 . The adaptor bell set forth in  claim 2  wherein: 
 the generally cylindrical body includes a circumferential radially inwardly projecting ridge delimiting the gasket engagement surface at the first end thereof.    
   
   
       4 . The adaptor bell set forth in  claim 1  wherein: 
 the shoulder comprises a transverse end face delimiting the gasket support surface opposite the second end thereof.