Sucker rod guide

Abstract

A sucker rod guide includes a body defining an axial aperture surface defining screw threads for engagement with screw threads of a rod insertable into the aperture.

I (we) claim: 
     
         1 . A guide for a sucker rod, said guide comprising a body defining an aperture extending through said body, said aperture defining an aperture surface having a screw thread defined on a longitudinal portion thereof. 
     
     
         2 . The guide for a sucker rod of  claim 1  wherein the body comprises a polymer. 
     
     
         3 . The guide for a sucker rod of  claim 1  wherein said longitudinal portion of said aperture surface has a length less than a length of said aperture surface. 
     
     
         4 . The guide for a sucker rod of  claim 1  wherein a surface of said body defines plural radially projecting fins. 
     
     
         5 . A sucker rod comprising:
 (a) an elongate rod having a portion of an outer surface defining a screw thread;   (b) a sucker rod guide comprising a body defining an aperture extending through said body, said aperture defining an aperture surface having a screw thread defined on a longitudinal portion thereof, said sucker rod guide in threaded engagement with said elongate rod; and   (c) an end fitting in threaded engagement with said elongate rod.   
     
     
         6 . The sucker rod of  claim 5  wherein said rod comprises fiberglass. 
     
     
         7 . The sucker rod of  claim 5  wherein said portion of said outer surface of said rod defining said screw thread extends from a first end of said rod to a second end of said rod. 
     
     
         8 . The sucker rod of  claim 5  further comprising a sheath encircling a portion of said rod and arranged to bear on an end of said end fitting and an end of said sucker rod guide. 
     
     
         9 . The sucker rod of  claim 5  wherein said sucker rod guide comprises a polymer. 
     
     
         10 . The sucker rod of  claim 5  wherein said body of said sucker rod defines plural radially extending fins.