Mechanical chain adjuster for scraper elevator chains

摘要

A chain tension maintenance device for use with the bowl loading elevator of the excavating scraper variety which is adjustable to vary the slack in the chain and paddle structure. At least one idler arm having bell crank geometry is pivotally mounted to the elevator frame through a first pivot point. An idler wheel axially mounted at a second pivot point of the idler arm, is urged into tension maintaining contact with the elevator chains by force exerted through the third pivot point of the idler arm by an adjustable turnbuckle grounded to the elevator frame.