Patent ID: 7287299

Claim:
An apparatus for raising and lowering a trailing surface treatment element for a ground surface treating machine comprising: a pivot point on said machine including a cylindrical aperture; an actuator mounted at least on one end on said machine; an arm extending from said element through said pivot point to said actuator; a resilient interface member between said machine and said arm at said pivot point so that shocks to said element are absorbed at least in part by said interface member, wherein said resilient interface member includes a pair of separate cylindrical bushings sized be received, at least in part, within said aperture, said bushings including a shoulder portion configured to extend from said bushing but remain outside said aperture, said shoulder portion being of greater diameter than said bushings, a pin assembly extending through said bushings and engaging at least a portion of both shoulder portions, so that said bushings are maintained within said aperture and wherein the shoulder includes countersunk recess.