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Folding bumper arrangement

  • US 4,026,590 A
  • Filed: 06/14/1976
  • Issued: 05/31/1977
  • Est. Priority Date: 06/14/1976
  • Status: Expired due to Term
First Claim
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1. Retractable rear bumper means for attachment to the rear of self-propelled dump trucks having boxes which overhang the rear axles and extend rearwardly thereof with the retractable bumper means being coupled to the frame of said dump truck box and arranged to be disposed in normal stable disposition resistant to forward motion upon application of force from the rear thereof and being arranged to fold upwardly upon initiation of the raising of the dump truck box to a raised dumping position;

  • said bumper means comprising;

    (a) bumper bar means arranged to extend generally transversely across the rear of a dump truck and having a length which exceeds the inner tread width span of the rear wheels of said truck;

    (b) linkage means arranged to retain said bumper bar in said normal stable disposition and to raise said bumper bar in response to the initiation of raising of said dump truck box, said linkage means comprising;

    (1) a pair of laterally disposed first arms secured to said bumper bar at the lower ends thereof and being pivotally coupled to said dump truck box frame along the base of said box and generally between the rear axle on the rear of said dump truck box for pivoting of said bumper bar between said normal disposition and said retracted disposition;

    (2) abutment means for restraining the pivoting of said first arms beyond the point of said stable normal disposition; and

    (3) hydraulic lifting means coupled in circuit with the lifting cylinder of said dump truck box and having ram means for pivotally rocking said first arms in an arcuate direction to lift said bumper bar from said normal disposition to said retracted disposition in response to the flow of hydraulic fluid from said lifting cylinder.

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