Packoff subassembly

Abstract

A packoff subassembly comprises the body having a first camming member secured at one end thereof and a second camming member supported thereon for relative sliding movement with respect thereto. The first and second camming members have outwardly angularly extending camming surfaces facing one another, and an elastomeric seal is mounted between the camming surfaces. A hub extends from the end of the body remote from the first camming member and threadedly receives a nut adapted to move the first and second camming surfaces toward one another thereby forcing the elastomeric seal outwardly and into sealing engagement with the surrounding surface.

1 . A packoff subassembly comprising: 
 a body having a first camming surface extending outwardly therefrom;    a second camming surface supported on the body for movement toward and away from the first camming surface;    an elastomeric seal supported on the body between the first camming surface and the second camming surface; and    means for selectively moving the first camming surface and the second camming surface toward one another and thereby forcing the elastomeric seal outwardly from the body and into sealing engagement with the surrounding surface.    
     
     
         2 . The packoff subassembly according to  claim 1  wherein the first and second camming surfaces face one another, and wherein the elastomeric seal comprises opposed surfaces engaging the first and second camming surfaces.  
     
     
         3 . The packoff subassembly according to  claim 1  further including: 
 a first camming member secured to the body and having the first camming surface formed thereon; and  
 a second camming member supported on the body and having the second camming surface formed thereon; and  
 the second camming member and the body being supported for relative sliding movement with respect to each other.  
 
     
     
         4 . The packoff subassembly according to  claim 3  wherein the first camming surface extends toward the second camming member and angularly outwardly relative to the body, and wherein the second camming surface extends toward the first camming member and angularly outwardly relative to the body.  
     
     
         5 . The packoff subassembly according to  claim 4  further characterized by a threaded member for effecting relative movement between the body and the second camming member.  
     
     
         6 . A packoff subassembly comprising: 
 a cylindrical body;    a first camming member fixedly secured to one end of the cylindrical body;    a first camming surface formed on the first camming member;    a second camming member supported on the body;    a second camming surface formed on the second camming member;    a second camming member and the body being supported for relative sliding movement with respect to each other;    the first camming surface and the second camming surfacing facing one another;    an elastomeric seal supported on the cylindrical body between the first camming surface and the second camming surface; and    means for effecting relative sliding movement between the second camming member and the body in a direction that moves the first camming surface and the second camming surface toward one another thereby forcing the elastomeric seal outwardly and into engagement with a surrounding surface.    
     
     
         7 . The packoff subassembly according to  claim 6  wherein the first camming surface extends angularly outwardly from the body and toward the second camming member; 
 the second camming surface extends angularly outwardly from the body and toward the first camming member; and  
 the elastomeric seal comprises surfaces mounted in engagement with the first and second camming surfaces.  
 
     
     
         8 . The packoff subassembly according to  claim 7  wherein the first camming member is cylindrical in shape and is characterized by a predetermined diameter; 
 the second camming member is cylindrical in shape and is characterized by a predetermined diameter substantially identical to the diameter of the first camming member; and  
 the elastomeric seal is cylindrical in shape and is characterized by an initial diameter which is substantially identical to the diameters of the first camming member and the second camming member.  
 
     
     
         9 . The packoff subassembly according to  claim 8  further including a hub extending from the end of the body remote from the first camming member and comprising a threaded section located immediately adjacent the intersection of the hub and the body; and 
 a nut threadedly engaged with the hub for selectively effecting relative sliding movement between the second camming member and the body.  
 
     
     
         10 . The packoff subassembly according to  claim 9  further including a plurality of threaded apertures formed in the second camming member for securing the packoff subassembly in engagement with an end of a length of pipe.