Patent ID: 7140112

Claim:
A head cover trimming system for cutting grass around a substantially ground level sprinkler head comprising: a sprinkler head including a housing having a top cover portion and a buried body portion; a head cap provided on the sprinkler head, said head cap including a main body portion fixed to the top cover portion of the housing, said main body portion including a top surface provided with a centering member; and a cutting head system including: a head member having a peripheral edge portion interconnected to a central hub through an intermediate web portion, said head member being adapted to extend about the sprinkler head; a cutting element projecting from the peripheral edge portion of the head member; a drive shaft member having a driven end portion extending to a driving end portion, said driving end portion being drivingly connected to the head member; a centering element housing extending into the head member, said centering element housing having a first end secured to the head member, a second end, and a hollow cylindrical main body portion extending therebetween; a centering element positioned in the centering element housing, extending within the head member and projecting beyond the cutting element, said centering element being adapted to engage with the centering member of the head cap to center the head member about the sprinkler head such that, upon application of a driving force to the driven end portion of the drive shaft, the head member rotates about the sprinkler head causing the cutting element to trim around the sprinkler head; a spring member extending within the head member, said centering element being retractably mounted within the head member, with the spring member biasing the centering element outward from the head member; and a cutting element holder, said cutting element holder having a first edge portion detachably secured to the head member and a second edge portion defining a cutting blade receiving recess.