the elevator frame application_number US 85088077 A description the invention is fully shown in the accompanying drawings wherein fig1 presents the environment typical for the application of an elevator chain tensioner in fig1 an elevating scraper generally 10 includes a forward drive section 12 accommodating an operator 39 s compartment 14 and supported on driven axle and wheel assembly 16 the forward drive section is a conventional apparatus of a scraper and generally includes an engine and drive train not specifically shown pivotally attached at articulation point 20 to the forward drive section is a trailing rear section generally 22 in the scraper shown this rear section 22 is equipped with a rear drive engine 24 and drive train to drive the rear wheel and axle assembly 26 however it is also common to manufacture elevating scrapers without rear engines the conventional functional parts of the scraper include the bowl 30 the cutting edge 32 the side cutter blades 34 the bowl cylinders one shown as 36 the elevator generally 40 which is the specific apparatus of importance to this invention and an ejector 42 which may slide forward in the bowl 30 to assist in unloading the bowl in operation the scraper is driven over a path to be excavated with the cutting edge 32 lowered below the ground surface as the excavated material builds up on the apron or floor of the bowl 30 the elevator 40 will be driven in a counterclockwise direction to load material into the bowl when the bowl is full the operator elevates the cutting edge 32 and the bowl 30 to prevent further loading this process is conventional the remaining figures show three embodiments of elevators equipped with variations of this invention in each of these.