Head cover trimming system

Abstract

A head cover trimming system for trimming around a ground level head cover includes a head cap and a grass trimmer assembly. The head cap is provided on the head cover and includes a centering member. The grass trimmer assembly includes a head member having a peripheral edge portion along which is mounted a cutting element. The grass trimmer assembly is driven through a drive shaft connected to a rotary tool at one end. Arranged within the head member is a retractable centering shaft. When the head member is placed over the head cover, the centering shaft is received by the centering member to center the grass trimmer about the head cover. The centering shaft retracts into the head member to allow the rotating cutting element to trim the area around the head cover.

1 - 19 . (canceled)  
   
   
       20 . A method of trimming around a ground level head cover comprising: 
 centering a cutting head member, including a cutting blade, over the ground level head cover by engaging a retractably mounted centering element, attached to the cutting head member, with a centering member on the ground level head cover;    shifting the cutting head downward, with the centering element retracting into the cutting head member to allow the cutting blade to be positioned about the ground level head cover;    rotating the cutting blade about the ground level head cover; and    lifting the cutting head member from the sprinkler head.    
   
   
       21 . The method of  claim 20 , further comprising: biasing the centering element to an extended position wherein the centering element projects beyond the cutting blade.