Tractor-scraper units with push-pull coupling including two-way shock absorbers

A push-pull coupling for a tandem arrangement of earthmoving scraper units comprising:

• a first push block fixedly secured to the tail end portion of a forward scraper unit and having a pulling hook projecting therefrom,
• a second push block pivotally mounted at the upper end thereof to the front end of a tractor of a rearward scraper unit for contact said first push block to establish a pushing relationship between the scraper units, said second push block having means mounted thereon for engaging said pulling hook in such a manner as to be hooked thereby to establish a pulling relationship between the scraper units, and
• at least two sets of two-way, compressive shock absorber means, connected respectively between the lower part of said second push block of said rearward scraper unit and a reinforcing member secured to a tractor framework of said rearward scraper said rearward unit, each of said two-way compressive shock absorbing means being dually effective to lessen shocks between said units both when said forward scraper unit is pushing said forward scraper unit and when said rearward scraper unit is pulling said forward scraper unit.