Abstract: A push-pull coupling for tandem earthmoving scrapers is disclosed wherein the coupling may be rapidly connected or disconnected, thereby permitting the scrapers to operate either in unison or separately. A push block having a pulling hook projecting therefrom is mounted on the rear of a forward scraper, while a push block and a bail for engaging the hook are mounted on the front of a rearward scraper. Furthermore, at least two sets of two-way shock absorber assemblies which can absorb the shock loads caused in the course of the pushing or pulling operations are respectively connected between the push block of the rearward scraper and a reinforcing member fixedly secured to the front thereof.

Abstract: A coupling capable of selectively connecting and disconnecting tractor-scraper units so that they may operate either in push-pull tandem relation or individually. A first push block and pulling hook are arranged at the rear of the front tractor-scraper unit, whereas on the front of the rear unit there are arranged a second push block for contact with the first push block and a ball for engagement of the pulling hook. The second push block is pivotally supported at its top end, and the bail is pivotally connected to the bottom end of the second push block. Arranged between the bottom end of the second push block and the tractor framework of the rear unit are a pair of what are herein termed two-way shock-absorber assemblies which are dually effective to minimize the shocks caused upon contact between the first and second push blocks and upon engagement of the pulling hook by the bail.