Patent ID: 7207400

Claim:
A coupler for use in connecting together in a driving relationship a first member and a second member in a rotatable cutter assembly, the coupler comprising: an elongate body having an axial forward end and an axial rearward end, and the elongate body containing a longitudinal bore; the elongate body further including a mediate collar, a forward body portion of the elongate body being axial forward of the collar whereby the forward body portion is suitable to drivingly engage the first member and a rearward body portion of the elongate body being axial rearward of the collar whereby the rearward body portion is suitable to drivingly engage the second member; a forward seal bonded to the forward body portion of the elongate body, the forward seal being spaced apart from the collar, and the forward seal creating a continuous fluid-tight seal between the coupler and the first member when the coupler drivingly engages the first member; and a rearward seal bonded to the rearward body portion of the elongate body, the rearward seal being spaced apart from the collar, and the rearward seal creating a continuous fluid-tight seal between the coupler and the second member when the coupler drivingly engages the second member.